Use the dateItem format of the date:
Convert your date to date items. convert myDate to dateItems Now add your time increments to the appropriate item add 17 to item 5 of myDate -- hours add 3 to item 4 of myDate -- days Then convert to dateItems again convert myDate to dateItems Convert back to the date format you were using
To increment by weeks just add or subtract 7 days, item 3 of the dateItems.
To increment by months just add the number of months to item 2 of the dateItems.
Your February problem will be taken care of automatically if you are incrementing by the number of months.
Use seconds only when you want to know how many days are between two dates.
put (dateInSeconds1-dateInSeconds2)/(86400) into theDaysInBetween
Using item 7 of the dateItems allows you to calculate dates such as 'the second Monday of March.'
And so on.
Michael
On Feb 26, 2005, at 4:55 AM, jbv wrote:
Hi revolutionaries,
What is the best way to make artithmetic operations on dates ? For instance I have a list of events stored with the date & time of occurence, and I'd like to quickly pick up those that took place during the last 17 hours, or the last 3 days, or the last 7 weeks or the last 19 months...
I know this can be done with SQL but I don't want to set up a database just for that... The best thing I came up with is to convert each event date into seconds, subtract the amount of seconds of the interval of time, and then pick up all items greater than that... But I have the feeling that computing the interval in seconds might get tricky when there's a february 29 in it (for instance)...
Any better idea ? Thanks, JB
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