611 lines
17 KiB
HTML
611 lines
17 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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><HEAD
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><TITLE
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>What are Time Zones?</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="Managing Accurate Date and Time"
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HREF="index.html"><LINK
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REL="PREVIOUS"
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TITLE="Computer Global Date and Time Concept"
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HREF="time.html"><LINK
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REL="NEXT"
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TITLE="The Correct Settings for Your Linux Box"
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HREF="set.html"></HEAD
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><BODY
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CLASS="section"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Managing Accurate Date and Time</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="time.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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></TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="set.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="section"
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><H1
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CLASS="section"
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><A
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NAME="tz"
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></A
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>3. What are Time Zones?</H1
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><P
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>Time Zones are a geographical world globe division of 15<SUP
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>o</SUP
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> each, starting at Greenwich, in England, created to help people know what time is it now in another part of the world.</P
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><P
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>Nowadays it is much more a political division than geographical, because sometimes people needs to have the same time as other people in not-so-far locations. And for energy savings reasons, we have today the <A
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HREF="tz.html#tz.dst"
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>Daylight Savings Time</A
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>, that are also a Time Zone variation.</P
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><P
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>Time Zones are usually defined by your country government or some astronomical institute, and is represented by 3 or 4 letters. See <A
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HREF="tz.html#tz.examples"
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>Section 3.2</A
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> for examples.</P
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><P
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>Use the <A
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HREF="http://www.timezoneconverter.com/"
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TARGET="_top"
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>timezoneconverter.com</A
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> to know what time is it now at any part of the globe.</P
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><DIV
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CLASS="section"
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><H2
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CLASS="section"
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><A
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NAME="tz.dst"
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></A
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>3.1. Daylight Savings Time</H2
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><P
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>For energy savings reasons, governments created the Daylight Savings Time. Our clocks are forwarded one hour, and this makes our days look longer. In fact, what really happens is only a Time Zone change. The primitive time (<SPAN
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CLASS="acronym"
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>UTC</SPAN
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>) is still, and will allways be, the same.</P
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><P
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>Later we'll see how to enable and disable <SPAN
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CLASS="acronym"
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>DST</SPAN
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> automatically in Linux.</P
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></DIV
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><DIV
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CLASS="section"
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><H2
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CLASS="section"
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><A
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NAME="tz.examples"
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></A
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>3.2. Time Zones Examples</H2
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><P
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>There is nothing better than examples:</P
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><DIV
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CLASS="table"
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><A
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NAME="tz.ex.br"
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></A
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><P
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><B
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>Table 1. Brazilian Time Zones. Shifts relative to <SPAN
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CLASS="acronym"
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>UTC</SPAN
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></B
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></P
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><TABLE
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BORDER="1"
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CLASS="CALSTABLE"
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><THEAD
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><TR
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><TH
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>Name and Shift</TH
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><TH
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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><A
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HREF="tz.html#tz.dst"
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><SPAN
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CLASS="acronym"
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>DST</SPAN
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></A
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> Name and Shift</TH
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><TH
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>Locations</TH
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></TR
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></THEAD
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><TBODY
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><TR
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><TD
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>BREST -2:00</TD
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><TD
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>BREDT -1:00</TD
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><TD
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>Fernando de Noronha</TD
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></TR
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><TR
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><TD
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>BRST -3:00</TD
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><TD
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>BRDT -2:00</TD
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><TD
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>S<EFBFBD>o Paulo, Rio, Brasilia, Minas Gerais, North East Region, South Region,etc</TD
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></TR
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><TR
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><TD
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>BRWST -4:00</TD
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><TD
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>BRWDT -3:00</TD
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><TD
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>West Region</TD
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></TR
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><TR
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><TD
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>BRAST -5:00</TD
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><TD
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>BRADT -4:00</TD
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><TD
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ALIGN="LEFT"
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VALIGN="MIDDLE"
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>Acre</TD
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></TR
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></TBODY
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></TABLE
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></DIV
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><P
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>Please send me contributions like this table for US Time Zones.</P
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></DIV
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><DIV
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CLASS="section"
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><H2
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CLASS="section"
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><A
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NAME="tz.linux"
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></A
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>3.3. Time Zone Mechanism on Linux</H2
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><P
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>Linux systems uses the GLIBC dynamic Time Zones, based on <TT
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CLASS="filename"
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>/etc/localtime</TT
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>. This file is a link to (or a copy of) a zone information file, usually located under <TT
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CLASS="filename"
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>/usr/share/zoneinfo</TT
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> directory.</P
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><P
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>From a geophysical perspective, there is only 360<SUP
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>o</SUP
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>/15<SUP
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>o</SUP
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>=24 Time Zones in the world. But to make things easy to people, and to accommodate all the political variations (like Daylight Savings Time), you'll find hundreds of zoneinfo files in <TT
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CLASS="filename"
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>/usr/share/zoneinfo</TT
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>, each for every world city, country, etc.</P
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><P
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>Some countries, like Brazil, don't have a fixed day to start Daylight Savings Time. It is defined every year, a couple of months before summer, and you may end up in a situation you'll have to change your zoneinfo file, which was compiled by <B
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CLASS="command"
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>zic</B
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> from a text file like this.</P
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><DIV
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CLASS="example"
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><A
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NAME="AEN271"
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></A
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><P
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><B
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>Example 1. Brazilian Zone Info text file</B
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></P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="programlisting"
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> # Brazil Time Zones
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#
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# Brazilian Time Zones are:
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# BREST: East of Brasilia. Fernando de Noronha.
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# BRST: Brasilia, São Paulo, Rio, Northeast, South etc
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# BRWST: West of Brasilia. Mato Grosso, Manaus
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# BRAST: Acre.
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#
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# In daylight saving time, letter 'S' changes to 'D'.
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# All the brazilian daylight changes can be found here:
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# http://pcdsh01.on.br/
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# http://pcdsh01.on.br/verao1.html
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#
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# To install, make:
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#
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# # zic Brazil.txt
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#
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# Zone files will be installed in /usr/share/zoneinfo (depends on your
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# distribution). Then, make a symbolic link from your zone to /etc/localtime:
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#
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# # cd /etc; ln -sf /usr/share/zoneinfo/Brazil/Brasilia localtime
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#
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#
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# If you have updates and new standards to this file please send to
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# Avi Alkalay (avi @ unix.sh)
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# Fred Neves (fneves @ registro.br)
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#
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# Last update: 12 Oct 2005
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#
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#
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# This file is available at
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#
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# http://avi.alkalay.net/software/zoneinfo/
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#
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# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
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Rule Brazil 1931 1932 - Oct 3 00:00 1:00 D
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Rule Brazil 1932 1933 - Mar 31 00:00 0 S
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Rule Brazil 1949 only - Dec 1 00:00 1:00 D
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Rule Brazil 1950 only - Apr 30 00:00 0 S
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Rule Brazil 1950 1952 - Dec 1 00:00 1:00 D
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Rule Brazil 1951 only - Apr 16 00:00 0 S
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Rule Brazil 1952 only - Mar 31 00:00 0 S
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Rule Brazil 1953 only - Feb 28 00:00 0 S
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Rule Brazil 1963 only - Oct 23 00:00 1:00 D
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Rule Brazil 1964 only - Mar 1 00:00 0 S
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Rule Brazil 1965 only - Jan 31 00:00 1:00 D
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Rule Brazil 1965 only - Mar 31 00:00 0 S
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Rule Brazil 1965 only - Dec 1 00:00 1:00 D
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Rule Brazil 1966 1968 - Mar 1 00:00 0 S
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Rule Brazil 1966 1967 - Nov 1 00:00 1:00 D
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Rule Brazil 1984 only - Nov 2 00:00 1:00 D
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Rule Brazil 1985 only - Mar 15 00:00 0 S
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Rule Brazil 1985 only - Nov 2 00:00 1:00 D
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Rule Brazil 1986 only - Mar 15 00:00 0 S
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Rule Brazil 1986 only - Oct 25 00:00 1:00 D
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Rule Brazil 1987 only - Feb 14 00:00 0 S
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Rule Brazil 1987 only - Oct 25 00:00 1:00 D
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Rule Brazil 1988 only - Feb 7 00:00 0 S
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Rule Brazil 1988 only - Oct 16 00:00 1:00 D
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Rule Brazil 1989 only - Jan 29 00:00 0 S
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Rule Brazil 1989 only - Oct 15 00:00 1:00 D
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Rule Brazil 1990 only - Feb 11 00:00 0 S
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Rule Brazil 1990 only - Oct 21 00:00 1:00 D
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Rule Brazil 1991 only - Feb 17 00:00 0 S
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Rule Brazil 1991 only - Oct 20 00:00 1:00 D
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Rule Brazil 1992 only - Feb 9 00:00 0 S
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Rule Brazil 1992 only - Oct 25 00:00 1:00 D
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Rule Brazil 1993 only - Jan 31 00:00 0 S
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Rule Brazil 1993 only - Oct 17 00:00 1:00 D
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Rule Brazil 1994 only - Feb 20 00:00 0 S
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Rule Brazil 1994 only - Oct 16 00:00 1:00 D
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Rule Brazil 1995 only - Feb 19 00:00 0 S
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Rule Brazil 1995 only - Oct 15 00:00 1:00 D
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Rule Brazil 1996 only - Feb 11 00:00 0 S
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Rule Brazil 1996 only - Oct 06 00:00 1:00 D
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Rule Brazil 1997 only - Feb 16 00:00 0 S
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Rule Brazil 1997 only - Oct 06 00:00 1:00 D
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Rule Brazil 1998 only - Mar 01 00:00 0 S
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Rule Brazil 1998 only - Oct 11 00:00 1:00 D
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Rule Brazil 1999 only - Feb 21 00:00 0 S
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Rule Brazil 1999 only - Oct 3 00:00 1:00 D
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Rule Brazil 2000 only - Feb 27 00:00 0 S
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Rule Brazil 2000 only - Oct 8 00:00 1:00 D
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Rule Brazil 2001 only - Feb 18 00:00 0 S
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Rule Brazil 2001 only - Oct 14 00:00 1:00 D
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Rule Brazil 2002 only - Feb 17 00:00 0 S
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Rule Brazil 2002 only - Nov 3 00:00 1:00 D
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Rule Brazil 2003 only - Feb 16 00:00 0 S
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Rule Brazil 2003 only - Oct 19 00:00 1 D
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Rule Brazil 2004 only - Feb 15 00:00 0 S
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Rule Brazil 2004 only - Nov 2 00:00 1 D
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Rule Brazil 2005 only - Feb 20 00:00 0 S
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Rule Brazil 2005 only - Oct 16 00:00 1 D
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Rule Brazil 2006 only - Feb 19 00:00 0 S
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# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
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Zone Brazil/DeNoronha -2:00 Brazil BRE%sT
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Zone posix/Brazil/DeNoronha -2:00 Brazil BRE%sT
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Zone right/Brazil/DeNoronha -2:00 Brazil BRE%sT
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Zone America/Sao_Paulo -3:00 Brazil BR%sT
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Zone America/Rio_de_Janeiro -3:00 Brazil BR%sT
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Zone America/Brasilia -3:00 Brazil BR%sT
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Zone posix/America/Sao_Paulo -3:00 Brazil BR%sT
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Zone posix/America/Rio_de_Janeiro -3:00 Brazil BR%sT
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Zone posix/America/Salvador -3:00 Brazil BR%sT
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Zone posix/America/Brasilia -3:00 Brazil BR%sT
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Zone posix/Brazil/Central -3:00 Brazil BR%sT
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Zone posix/Brazil/Brasilia -3:00 Brazil BR%sT
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Zone posix/Brazil/Sao_Paulo -3:00 Brazil BR%sT
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Zone posix/Brazil/Salvador -3:00 Brazil BR%sT
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Zone posix/Brazil/Rio_de_Janeiro -3:00 Brazil BR%sT
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Zone right/America/Sao_Paulo -3:00 Brazil BR%sT
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Zone right/America/Rio_de_Janeiro -3:00 Brazil BR%sT
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Zone right/America/Salvador -3:00 Brazil BR%sT
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Zone right/America/Brasilia -3:00 Brazil BR%sT
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Zone right/Brazil/Central -3:00 Brazil BR%sT
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Zone right/Brazil/Brasilia -3:00 Brazil BR%sT
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Zone right/Brazil/Sao_Paulo -3:00 Brazil BR%sT
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Zone right/Brazil/Salvador -3:00 Brazil BR%sT
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Zone right/Brazil/Rio_de_Janeiro -3:00 Brazil BR%sT
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Zone Brazil/Central -3:00 Brazil BR%sT
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Zone Brazil/Brasilia -3:00 Brazil BR%sT
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Zone Brazil/Sao_Paulo -3:00 Brazil BR%sT
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Zone Brazil/Rio_de_Janeiro -3:00 Brazil BR%sT
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Zone Brazil/Salvador -3:00 Brazil BR%sT
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Zone Brazil/East -3:00 Brazil BR%sT
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Zone posix/Brazil/East -3:00 Brazil BR%sT
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Zone right/Brazil/East -3:00 Brazil BR%sT
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Zone Brazil/West -4:00 Brazil BRW%sT
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Zone Brazil/Manaus -4:00 Brazil BRW%sT
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Zone Brazil/Rondonia -4:00 Brazil BRW%sT
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Zone Brazil/Roraima -4:00 Brazil BRW%sT
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Zone Brazil/Mato_Grosso -4:00 Brazil BRW%sT
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Zone posix/Brazil/Manaus -4:00 Brazil BRW%sT
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Zone posix/Brazil/Mato_Grosso -4:00 Brazil BRW%sT
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Zone right/Brazil/Manaus -4:00 Brazil BRW%sT
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Zone right/Brazil/Mato_Grosso -4:00 Brazil BRW%sT
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Zone posix/America/Manaus -4:00 Brazil BRW%sT
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Zone right/America/Manaus -4:00 Brazil BRW%sT
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Zone Brazil/Acre -5:00 Brazil BRA%sT
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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></DIV
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><P
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>The <B
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CLASS="command"
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>Rule</B
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> block defines the date and time we change the Time Zone, while in the <B
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CLASS="command"
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>Zone</B
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> block we reference the <B
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CLASS="command"
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>Rule</B
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> will manage it. Note that the <B
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CLASS="command"
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>Zone</B
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> name is actually the file name under <TT
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CLASS="filename"
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>/usr/share/zoneinfo</TT
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> directory, and here we defined several different names for the same Time Zone, just to be easyer for people to find their zone.</P
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><P
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>This file's comments explains how to install these time zones, using the <B
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CLASS="command"
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>zic</B
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> zoneinfo compiler (which already installs them also). To make it effective, you only have to link (or copy) the zoneinfo file to <TT
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CLASS="filename"
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>/etc/localtime</TT
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>. In some distributions, there is a higher level (and preferred) way to set the Time Zone, described in <A
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HREF="set.html#set.tz"
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>Section 4.1</A
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>.</P
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><P
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>After making <TT
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CLASS="filename"
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>/etc/localtime</TT
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> pointing to the correct zoneinfo file, you are already under that zone rules and <SPAN
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CLASS="acronym"
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>DST</SPAN
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> changes are automatic -- you don't have to change time manually.</P
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><P
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>The following command sequence shows Linux Time Zone mechanics dynamism. Note they were all issued in less than one minute:</P
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||
><TABLE
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||
BORDER="0"
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||
BGCOLOR="#E0E0E0"
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||
WIDTH="100%"
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||
><TR
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||
><TD
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||
><FONT
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||
COLOR="#000000"
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><PRE
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||
CLASS="screen"
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><TT
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CLASS="prompt"
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>bash$ </TT
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><B
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CLASS="command"
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>ls -al /etc/localtime</B
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>
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lrwxrwxrwx 1 root root 35 May 22 2001 /etc/localtime -> <EM
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>/usr/share/zoneinfo/Brazil/Brasilia</EM
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>
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<TT
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CLASS="prompt"
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>bash$ </TT
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><B
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CLASS="command"
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>date</B
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>
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Fri Mar 29 20:13:38 <EM
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>BRST</EM
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> 2002
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<TT
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CLASS="prompt"
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>bash# </TT
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><B
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CLASS="command"
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>ln -sf /usr/share/zoneinfo/GMT /etc/localtime</B
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>
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<TT
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CLASS="prompt"
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>bash$ </TT
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><B
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CLASS="command"
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>date</B
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>
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Fri Mar 29 23:13:47 <EM
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>GMT</EM
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> 2002
|
||
<TT
|
||
CLASS="prompt"
|
||
>bash# </TT
|
||
><B
|
||
CLASS="command"
|
||
>ln -sf /usr/share/zoneinfo/Brazil/Brasilia /etc/localtime</B
|
||
>
|
||
<TT
|
||
CLASS="prompt"
|
||
>bash$ </TT
|
||
><B
|
||
CLASS="command"
|
||
>date</B
|
||
>
|
||
Fri Mar 29 20:14:03 <EM
|
||
>BRST</EM
|
||
> 2002</PRE
|
||
></FONT
|
||
></TD
|
||
></TR
|
||
></TABLE
|
||
><P
|
||
>At 20:13, I was in my default brazilian Time Zone (BRST), then I switched to GMT and my system time changed to 23:13! When your Time Zone enters DST, you'll see a similar effect, but the rules are all inside your Time Zone (<TT
|
||
CLASS="filename"
|
||
>/etc/localtime</TT
|
||
> link doesn't change like this example).</P
|
||
><P
|
||
>An application running in this machine (eg. web-server generating access logs) will feel this change, so it is very important for developers to remember that the full Time Concept is the current <EM
|
||
>time</EM
|
||
> plus current <EM
|
||
>Time Zone</EM
|
||
>, as described in <A
|
||
HREF="time.html"
|
||
>Section 2</A
|
||
>.</P
|
||
><P
|
||
>In the end, I switched back to my correct Time Zone.</P
|
||
></DIV
|
||
></DIV
|
||
><DIV
|
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CLASS="NAVFOOTER"
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><TR
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><TD
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><A
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HREF="time.html"
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>Prev</A
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>Computer Global Date and Time Concept</TD
|
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><TD
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WIDTH="34%"
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VALIGN="top"
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> </TD
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><TD
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>The Correct Settings for Your Linux Box</TD
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