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Re: change hour in timestamp

by johngg (Canon)
on Jun 04, 2022 at 22:15 UTC ( #11144399=note: print w/replies, xml ) Need Help??

in reply to change hour in timestamp

The Time::Piece module, along with its associated Time::Seconds module for date calculations, is core.

johngg@abouriou:~/perl/Monks$ perl -Mstrict -Mwarnings -MTime::Piece - +MTime::Seconds -E 'say q{}; my $date = q{Sat Jun 4 22:47:31 2022}; my $tp = Time::Piece->strptime( $date, q{%a %b %d %T %Y} ); $tp -= ONE_HOUR; $tp -= ONE_HOUR; say $tp->strftime();' Sat, 04 Jun 2022 20:47:31 UTC

I hope that this is helpful.



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Re^2: change hour in timestamp
by kcott (Archbishop) on Jun 05, 2022 at 00:54 UTC

    G'day JohnGG,

    ++ Upon reading the OP, I immediately thought of Time::Piece; then, after scrolling through the posts, I saw you'd used this already.

    If I may, some minor improvements:

    • Instead of decrementing $tp in two statements, you can do that in one: "$tp -= 2 * ONE_HOUR".
    • Your output has a slightly different format to the OP's input: comma after day and introduced timezone. You can mostly fix that by using the same date format for the input and output.
      Update: On rereading, I also see the month name and day are swapped as are the time and year. The suggested fix handles both of those cases also.
    • If the leading zero on the month nameday is a problem for the OP, you can fix that with sprintf. I added a "$tp += 6 * ONE_DAY" to test that.
      • Checking `man strptime` on my Cygwin platform, I see %d gives a two-digit string, padded with a zero for a single-digit month day. I couldn't find a format for that which doesn't pad with a zero. Assuming I didn't simply miss it, if one exists on another OS, it may not be portable.

    Here's the updated code:

    my $date = q{Sat Jun 4 22:47:31 2022}; my $fmt_t = q{%a %b %d %T %Y}; my $fmt_s = q{%s %s %2d %s %d}; my $tp = Time::Piece->strptime($date, $fmt_t); $tp -= 2 * ONE_HOUR; say sprintf $fmt_s, split q{ }, $tp->strftime($fmt_t); $tp += 6 * ONE_DAY; say sprintf $fmt_s, split q{ }, $tp->strftime($fmt_t);

    which outputs:

    Sat Jun 4 20:47:31 2022 Fri Jun 10 20:47:31 2022

    — Ken

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