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View Full Version : calculating the difference between two date&time



anu
06-04-2007, 12:51 PM
Hai,
I am facing a problem while getting the difference between two dates in PHP. i used the following code
$diff=date("Y-m-d",strtotime('01-01-2007') - strtotime('01-01-2008')) but it is returning wrong date. i tried with most of the functions provided with php but still i can't. also How it will possible if the date is having time also. please send us the code if anybody already knows.
regards
anu

whizard
06-04-2007, 05:02 PM
What you're doing isn't going to return a date, its going to return an amount of time.

Dan

anu
06-05-2007, 06:47 AM
so what is the solution for that. i want the differnce between two date with time. pl help me to sort out this

Fou-Lu
06-05-2007, 08:47 AM
First, the format you are using is not valid for strtodate. You cannot use the hyphenated method directly with strtotime so instead use a slashed method: 01/01/2007.
Second, using the date() function on the return value will result in 1 year after unix epoch (January 1, 1970 00:00 OR December 31, 1969 11:59), which is December 31, 1970 for this example.
So, unless this is the result you want to use, your going to need to do some calculations:
60 seconds per minute
60 minutes per hour
24 hours per day
365.25 days per year
Total real days per year is 31 557 600 seconds.

Hope that helps you out!

[edit]
Thought I would throw this in too:
32-bit systems don't linke negative times too much (especially windows) so you may want to consider using an absolute value for your difference calculations.



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