StackOverflowNewbie StackOverflowNewbie - 5 months ago 20
PHP Question

Date Arithmetic in PHP

Is there a PHP function I can use to do something like the following:

  • Get the date 6 months ago (e.g. now - 6 months)?

  • Get the date 2 years from now (e.g. now + 2 years)?

Answer Source

Yes, there is: strtotime():

  1. 6 months ago: strtotime("-6 months");
  2. 2 years: strtotime("+2 years");

These will return Unix timestamps. So you might want to put the result into date() or localtime() or gmtime().

Please do not try to subtract 6 months or add 2 years of seconds to time(). This does not take into account things like daylight saving or leap seconds and still gives you a value in seconds which is unlikely to be the precision you need. Let the library functions do it.

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