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3.3. Converting Epoch Seconds to DMYHMS
3.3.1. Problem
You have a date and time in Epoch seconds, and you want to calculate
individual DMYHMS values from it.
3.3.2. Solution
Use the
localtime or gmtime functions,
depending on whether you want the date and time in UTC or your local
time zone.($seconds, $minutes, $hours, $day_of_month, $month, $year,
$wday, $yday, $isdst) = localtime($time);
The standard Time::timelocal and
Time::gmtime modules override the localtime and
gmtime functions to provide named access to the
individual values.use Time::localtime; # or Time::gmtime
$tm = localtime($TIME); # or gmtime($TIME)
$seconds = $tm->sec;
# ...
3.3.3. Discussion
The localtime and gmtime
functions return strange year and month values; the year has 1900
subtracted from it, and 0 is the month value for January. Be sure to
correct the base values for year and month, as this example does:($seconds, $minutes, $hours, $day_of_month, $month, $year,
$wday, $yday, $isdst) = localtime($time);
printf("Dateline: %02d:%02d:%02d-%04d/%02d/%02d\n",
$hours, $minutes, $seconds, $year+1900, $month+1,
$day_of_month);
We could have used the Time::localtime module to avoid the temporary
variables:use Time::localtime;
$tm = localtime($time);
printf("Dateline: %02d:%02d:%02d-%04d/%02d/%02d\n",
$tm->hour, $tm->min, $tm->sec, $tm->year+1900,
$tm->mon+1, $tm->mday);
3.3.4. See Also
The localtime function in
perlfunc(1) and Chapter 29 of
Programming Perl; the documentation for the
standard Time::localtime and Time::gmtime modules; convert in the
other direction using Recipe 3.2
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| 3.2. Converting DMYHMS to Epoch Seconds |  | 3.4. Adding to or Subtracting from a Date |
Copyright © 2003 O'Reilly & Associates. All rights reserved.
