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Full Discussion: How many weeks in a year
Top Forums Shell Programming and Scripting How many weeks in a year Post 52850 by Perderabo on Monday 28th of June 2004 08:54:25 AM
Old 06-28-2004
Navigate:
Our Home Page -> Answers to Frequently Asked Questions -> Yesterdays Date/Date Arithmetic

and take a look at my datacalc routine.

Try to compute the Modified Julian Date of February 29 of the year in question. If you succeed you have a leap year which has too many days to be only 52 weeks.

A non-leap is 364 days which is exactly 7 * 52. In my mind such a year is always 52 weeks in length. But to determine if the year exactly comprises 52 weeks each starting with Sunday, compute the Day of the Week of Jan 1. If Jan 1 is a Sunday, the anwser is yes.
 

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Time::Seconds(3pm)					 Perl Programmers Reference Guide					Time::Seconds(3pm)

NAME
Time::Seconds - a simple API to convert seconds to other date values SYNOPSIS
use Time::Piece; use Time::Seconds; my $t = localtime; $t += ONE_DAY; my $t2 = localtime; my $s = $t - $t2; print "Difference is: ", $s->days, " "; DESCRIPTION
This module is part of the Time::Piece distribution. It allows the user to find out the number of minutes, hours, days, weeks or years in a given number of seconds. It is returned by Time::Piece when you delta two Time::Piece objects. Time::Seconds also exports the following constants: ONE_DAY ONE_WEEK ONE_HOUR ONE_MINUTE ONE_MONTH ONE_YEAR ONE_FINANCIAL_MONTH LEAP_YEAR NON_LEAP_YEAR Since perl does not (yet?) support constant objects, these constants are in seconds only, so you cannot, for example, do this: "print ONE_WEEK->minutes;" METHODS
The following methods are available: my $val = Time::Seconds->new(SECONDS) $val->seconds; $val->minutes; $val->hours; $val->days; $val->weeks; $val->months; $val->financial_months; # 30 days $val->years; $val->pretty; # gives English representation of the delta The usual arithmetic (+,-,+=,-=) is also available on the objects. The methods make the assumption that there are 24 hours in a day, 7 days in a week, 365.24225 days in a year and 12 months in a year. (from The Calendar FAQ at http://www.tondering.dk/claus/calendar.html) AUTHOR
Matt Sergeant, matt@sergeant.org Tobias Brox, tobiasb@tobiasb.funcom.com BalieXXzs SzabieXX (dLux), dlux@kapu.hu LICENSE
Please see Time::Piece for the license. Bugs Currently the methods aren't as efficient as they could be, for reasons of clarity. This is probably a bad idea. perl v5.16.2 2012-10-11 Time::Seconds(3pm)
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