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time.2: NOTES: Fix description of "Seconds since the Epoch"
Reported-by: Alexander Schuch <Alex.Schuch@gmx.de> Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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.\" Modified Sat Jul 24 14:13:40 1993 by Rik Faith <faith@cs.unc.edu>
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.\" Additions by Joseph S. Myers <jsm28@cam.ac.uk>, 970909
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.\"
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.TH TIME 2 2010-02-25 "Linux" "Linux Programmer's Manual"
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.TH TIME 2 2011-09-09 "Linux" "Linux Programmer's Manual"
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.SH NAME
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time \- get time in seconds
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.SH SYNOPSIS
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@ -61,16 +61,18 @@ POSIX does not specify any error conditions.
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.SH NOTES
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POSIX.1 defines
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.I seconds since the Epoch
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as a value to be interpreted as the number of seconds between a
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specified time and the Epoch, according to a formula for conversion
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from UTC equivalent to conversion on the naive basis that leap
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seconds are ignored and all years divisible by 4 are leap years.
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using a formula that approximates the number of seconds between a
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specified time and the Epoch.
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This formula takes account of the facts that
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all years that are evenly divisible by 4 are leap years,
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but years that are evenly divisible by 100 are not leap years
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unless they are also evenly divisible by 400,
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in which case they are leap years.
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This value is not the same as the actual number of seconds between the time
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and the Epoch, because of leap seconds and because clocks are not
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and the Epoch, because of leap seconds and because system clocks are not
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required to be synchronized to a standard reference.
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The intention is
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that the interpretation of seconds since the Epoch values be
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consistent; see POSIX.1 Annex B 2.2.2 for further rationale.
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The intention is that the interpretation of seconds since the Epoch values be
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consistent; see POSIX.1-2008 Rationale A.4.15 for further rationale.
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.SH "SEE ALSO"
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.BR date (1),
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.BR gettimeofday (2),
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