Re: Date calculating software?
- To: mathgroup at smc.vnet.net
- Subject: [mg30412] Re: Date calculating software?
- From: Mark Westwood <mark at galeawestwood.freeserve.co.uk>
- Date: Fri, 17 Aug 2001 03:09:51 -0400 (EDT)
- References: <email@example.com>
- Sender: owner-wri-mathgroup at wolfram.com
Mathematica can do simple things like add a number of days to a given
date. Have a closer look at the documentation for the
Miscellaneous`Calendar standard add-on package, wherein you'll find a
DaysPlus[date, numberOfDays] function. You might want to check out the
standard function Date first to check how Mathematica represents dates.
Adding a number of months is a little trickier - how long are the months
you want to add ? Are they solar-mean months, lunar months, does an
added February have 28 or 29 days ? If you're not too concerned with
such niceties (or with the difficult question of how long a year is)
then the standard add-on package Miscellaeous`Units has some predefined
figures for Year, Month, Fortnight, etc.
And if you want to go a bit further into it 'Calendrical Calculations'
by Dershowitz and Reingold give a good algorithmic treatment of a lot of
the issues involved.
Pilot Solutions Ltd
> Is there a software program or calculator available that can eg. Add a
> period of time to a date?
> example, today is 14 August 2001.
> 14082001 + 18 months
> 14082001 + 1yr, 3mths, 4 days, and produces the date 1yr, 3mths and 4 days
> Thanks in advance
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