It is smart enough to handle daylight saving time issues and is way more reliable than using bunch of seconds for interval. But if you're in a UTC -0500 time zone (such as EST in North America), the maximum accepted time before overflow (for older PHP versions on Windows) is T22:14:07-0500Z, regardless of whether you're passing it to mktime() or gmmktime(). It takes timestamp value of current date and adds interval to it. For example, the 32-bit timestamp overflow occurs at T03:14:08+0000Z. These date inputs are used to form a database query to read rows within. In this tutorial, we are using jQuery DatePicker to choose the dates for the search options. It will return the filtered results from the database based on these dates input.
Will show how to work around that in my function.
An ISO 8601 repeating interval specification. During iteration this will contain the current date within the period. That only works until you hit daylight saving shift or something as obscure. Whether to include the start date in the set of recurring dates or not.
Since here I am writing for primary audience with different (and crazy, who puts month before day?) date format I stick to ISO formats in clear descending order.Īnd finally since programs usually deal with time as amount of seconds it seems easy to treat time spans as set of those (60*60*24).
PHP manual has proper list of date formats. PHP does its best to interpret them, but for X possible ways to write down date there are twice that ways it can go wrong. You can format output however you like, but it is important to be very careful with date inputs. Functions that are sensitive to that will even try to raise fuss if it isn’t set. In modern versions of PHP (which you should be using) is is handled by date_default_timezone_set function (or date.timezone in configuration). It is important to establish time zone environment. I needed range of days for one graph in Google Charts so I tried to make compact, flexible (and me-proof) function to generate range of dates. There are different time formats (almost freeform), time zones, daylight saving offsets and who knows what else to consider.Īs with any tricky task my rule of a thumb is to trust programming language and don’t trust Googled-up snippets too much. For modern projects use something more recent, like the Period library.ĭate and time values are nightmare in the world of binary (or decimal at best).