On Wed, Apr 2, 2008 at 2:24 AM, Jeff Pang <[EMAIL PROTECTED]> wrote:
> On 4/2/08, Chas. Owens <[EMAIL PROTECTED]> wrote:
> > On Wed, Apr 2, 2008 at 2:02 AM, Jeff Pang <[EMAIL PROTECTED]> wrote:
> > > On 4/2/08, Richard Lee <[EMAIL PROTECTED]> wrote:
> > > > What is the best way to indicate past hour from current time without
> > > > using a module?
> > > >
> > > > so if it's 12:00, then 11:00-12:00
> > > >
> > >
> > > I'd prefer using POSIX module since it's a built-in perl module.
> > > The code would be simple,
> > >
> > > use strict;
> > > use POSIX 'strftime';
> > >
> > > print get_time(time - 3600),"-",get_time(),"\n";
> > >
> > > sub get_time {
> > > my $timestamp = shift || time;
> > > return strftime("%H:%M",localtime($timestamp));
> > > }
> >
> > This is one of those seemingly simple questions that turns out to be
> > much more complicated than you originally think. For instance, what
> > is one hour less than 2008-03-09 03:00:00? If you answered 2008-03-09
> > 02:00:00 you would be wrong in the USA as that hour does not exist.
>
> It sounds strange to me.
> Why 2008-03-09 02:00:00 doesn't exist for USA people?
>
Because of Daylight Saving Time. Clocks are set from 01:59:59 to
03:00:00 on the second Sunday in March and from 01:59:59 to 01:00:00
on the first Sunday in November.
* http://en.wikipedia.org/wiki/Daylight_saving_time
--
Chas. Owens
wonkden.net
The most important skill a programmer can have is the ability to read.
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