On Thu, 10 Jun 2004, Matt Sisk wrote:
What I'd like to do is simply find the midpoint, more or less, between
two arbitrary datetimes. Off the cuff, knowing nothing about the
internals (which I do, but I'm pretending not to) I'd think this:
$mid = $dt1 + ($dt2 - $dt1)/2
to dwim.
On Thu, 10 Jun 2004, Matt Sisk wrote:
What I'd like to do is simply find the midpoint, more or less, between
two arbitrary datetimes. Off the cuff, knowing nothing about the
internals (which I do, but I'm pretending not to) I'd think this:
Also, I'd like to point out that this really doesn't
Dave Rolsky wrote:
Well, if you just want the _date_, it's pretty easy.
my $dur = $dt1-delta_days($dt2);
# or use Math::Round if you want
my $mid = $dt1-add( days = int( $dur-delta_days / 2 ) );
If you want to account for the time then it gets funkier.
Hmm, indeed.
I need to approximate solar noon
Dave Rolsky wrote:
Also, I'd like to point out that this really doesn't have as much to do
with the internals as it does with the nature of date time math.
You cannot expect to understand date math without understanding that it's
not possible to convert between various units of date/time, in
While malingering from actual work, I wrote some code to convert dates to
and from the Discordian calendar. Over the past couple of nights I made
it into a proper DateTime::Calendar module which I posted to PerlMonks
(http://www.perlmonks.org/index.pl?node_id=362936) This morning I also
packaged
On Thu, 10 Jun 2004, Jaldhar H. Vyas wrote:
While malingering from actual work, I wrote some code to convert dates to
and from the Discordian calendar. Over the past couple of nights I made
it into a proper DateTime::Calendar module which I posted to PerlMonks
On Thu, 10 Jun 2004, Dave Rolsky wrote:
Well, Rich Bowen had started working on the same module, so you should
talk to him. Reviewing the code/docs, I have a couple nits:
Oh yeah I just saw that in the list archives.
- The constructor shouldn't take rd_secs, rd_nanosecs, or locale, I don't
Matt Sisk wrote:
what is the midpoint of a span?
With DateTime::Span:
$mid_point =
$span-start-add_duration(
seconds = $span-duration-seconds / 2
);
With DateTime:
$mid_point =
$start-add_duration(
seconds = $end-subtract_datetime_absolute(
On Thu, 10 Jun 2004 [EMAIL PROTECTED] wrote:
Matt Sisk wrote:
what is the midpoint of a span?
With DateTime::Span:
$mid_point =
$span-start-add_duration(
seconds = $span-duration-seconds / 2
);
With DateTime:
$mid_point =
$start-add_duration(
seconds
0.2101 2004-06-10
- There was a bug in the date math code that occurred if you tried to
add enough days, minutes or seconds to generate a datetime 10 years in
the future (or so). If the the DateTime object had a a time zone with
recurring DST changes, then the date math operation would cause a
On Thu, 10 Jun 2004 [EMAIL PROTECTED] wrote:
How about a DateTime::Span-midpoint method?
On 11 Jun 2004, at 6:55 AM, Dave Rolsky replied:
Let's wait and see if others ask for it. For now, let's just add those
recipes to the faq.
I'm not sure of the best namespace, but I can see a Util namespace
On 6/11/04 Rick Measham wrote:
On Thu, 10 Jun 2004 [EMAIL PROTECTED] wrote:
How about a DateTime::Span-midpoint method?
On 11 Jun 2004, at 6:55 AM, Dave Rolsky replied:
Let's wait and see if others ask for it. For now, let's just
add those recipes to the faq.
I'm not sure of the best
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