RE: [PHP] strange behaviour with strtotime()

On 31 January 2006 15:41, Barry wrote: > Ford, Mike wrote: > > Yes, but 1 apple is 1 apple is 1 apple. > > > > 1 month can be 28 days, or 31 days, or anything in between. > 2 months can be anything from 59 to 62 days. > > > > A month is an imprecise measure, and adding them together > will get you an even more imprecise result. > > > > Deal with it -- that's just the way it is. > > > > Cheers! > > And now you tell me how the strtotime function tells what to use > either 28 days or 31 days or 4 3/87 days. It's very simple. It uses the same day-of-the-month you start from: 1st gets you the 1st; 15th gets you the 15th; 31st gets you 31st or equivalent). Put another way, "+1 month" adds as many days as there are days in the starting month; "+2 months" adds as many days as there are in the starting month and the one after (starting in Jan: 31+28 = 59 -- but starting in, say, Jul: 31+31 = 62); and so on. Most of the time this gives you exactly what you want -- it's only when you ask starting from the 29th, 30th or 31st of a month, and the destination month is shorter, that it causes any kind of problem. Since this is a very small, well-defined range of dates, it's fairly simple to deal with it -- once you know you need to!! Cheers! Mike --------------------------------------------------------------------- Mike Ford, Electronic Information Services Adviser, Learning Support Services, Learning & Information Services, JG125, James Graham Building, Leeds Metropolitan University, Headingley Campus, LEEDS, LS6 3QS, United Kingdom Email: m.ford@leedsmet.ac.uk Tel: +44 113 283 2600 extn 4730 Fax: +44 113 283 3211 To view the terms under which this email is distributed, please go to http://disclaimer.leedsmet.ac.uk/email.htm