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### Re: Simple date and time manipulation

by andreas1234567 (Vicar)
 on Jan 19, 2011 at 09:57 UTC ( #883075=note: print w/ replies, xml ) Need Help??

in reply to Simple date and time manipulation

It depends on your definition of "slow". I can create 10000 timestamps in ~3 seconds (Increased from 1000 to 10000 for more reliable count) with DateTime, which is also considered "slow" by some.

use strict; use warnings; use DateTime; use Benchmark qw(timethis); my \$dt = DateTime->new( year => 2011, month => 1, day => 1, hour => 0, minute => 0, second => 0, ); timethis( 10000, sub { print \$dt->ymd() . ' ' . \$dt->hms; \$dt->add(hours => 1, minutes => 2, seconds => 3); } ); timethis( 10000, sub { \$dt->add(hours => 1, minutes => 2, seconds => 3); } ); __END__ # Calc + print timethis 10000: 3 wallclock secs ( 3.09 usr + 0.06 sys = 3.15 CPU) +@ 3174.60/s (n=10000) # Just calc: timethis 10000: 3 wallclock secs ( 2.95 usr + 0.00 sys = 2.95 CPU) +@ 3389.83/s (n=10000)
If you are really in a hurry, the general consensus is to use Date::Calc. However, with it you would have to do more of the sprintf() formatting yourself.
use strict; use warnings; use DateTime; use Date::Calc qw (Add_Delta_DHMS); use Benchmark qw(cmpthese); my \$dt = DateTime->new( year => 2011, month => 1, day => 1, hour => 0, minute => 0, second => 0, ); my (\$year, \$month, \$day, \$hour, \$min, \$sec) = (2011, 1, 1, 0, 0, 0); cmpthese( -1, { 'DateTime' => sub { print \$dt->ymd() . ' ' . \$dt->hms; \$dt->add(hours => 1, minutes => 2, seconds => 3); }, 'Date::Calc' => sub { print \$year . '-' . \$month . '-' . \$day . ' ' . \$hour . '-' . \$m +in . '-' . \$sec; (\$year, \$month, \$day, \$hour, \$min, \$sec) = Add_Delta_DHMS(\$year, \$month, \$day, \$hour, \$min, \$sec, 0, 1, 2 +, 3); }, } ); __END__ \$ perl -l 883070.pl | tail -5 2011-07-18 10:20:15 2011-07-18 11:22:18 Rate DateTime Date::Calc DateTime 3258/s -- -99% Date::Calc 481882/s 14690% -- \$
Updated Wed Jan 19 11:12:58 CET 2011 with Date::Calc example.
--
No matter how great and destructive your problems may seem now, remember, you've probably only seen the tip of them. [1]

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