====== Datetime - Fu ======

===== Con el comando date podemos conocer la fecha y hora actual: =====

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===== Si quisiera mostrar el día, utilizo el comando date +%A: =====

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===== Y si también quiero el día del mes, pongo %d: =====

{{pasted_image_20230128175204.png|}}

===== Y si quiero saber el mes en que estamos, puedo poner %B: =====

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===== Print UNIX time (seconds since Jan 1, 1970, 00:00:00 UTC) =====

<code bash>
perl -le 'print time'
</code>

===== Print GMT (Greenwich Mean Time) and local computer time =====

<code bash>
perl -le 'print scalar gmtime'
perl -le 'print scalar localtime'
</code>

===== Print local computer time in H:M:S format =====

<code bash>
perl -le 'print join ":", (localtime)[2,1,0]'
</code>

===== Print yesterday’s date =====

<code bash>
perl -MPOSIX -le '@now = localtime; $now[3] -= 1; print scalar localtime mktime @now'
</code>

===== Print date 14 months, 9 days and 7 seconds ago =====

<code bash>
perl -MPOSIX -le '@now = localtime; $now[0] -= 7; $now[4] -= 14; $now[7] -= 9; print scalar localtime mktime @now'
</code>

===== Prepend timestamps to stdout (GMT, localtime) =====

<code bash>
tail -f logfile | perl -ne 'print scalar gmtime," ",$_'
tail -f logfile | perl -ne 'print scalar localtime," ",$_'
</code>