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thanks all It's common for us to overthink the complexity of date/time calculations and underthink the power and flexibility of PHP's built-in functions.

Consider I've been flicking through the comments looking for some succinct date code and have noticed an alarming number of questions and over-burdened examples related to date mathematics.

in the "datetime" attribute you should put a machine-readable value which represent time , the best value is a full time/date with ISO 8601 ( date('c') ) ,,, the attr will be hidden from usersand it doesn't really matter what you put as a shown value to the user,, any date/time format is okay !

Prior to PHP 5.6.23, Relative Formats for the start of the week aligned with PHP's (0=Sunday,6=Saturday).

Since 5.6.23, Relative Formats for the start of the week align with ISO-8601 (1=Monday,7=Sunday).

Since PHP 5.6.23 en 7.0.8 the support for requesting the weeknumber for a given date, where the first day of the week is Sunday, has been removed. This is sure that the information you shared is clearly identive and fabulous for keeping it in minds.

For those of us still needing it, here is simple hack to get the job done.

Thanks to tcasparr at gmail dot com for the great idea (at least for me) ;)I changed the code a little to replicate the functionality of date_parse_from_format, once I don't have PHP 5.3.0 yet. Hope you don't mind changing your code tcasparr at gmail dot com./******************************************************* * Simple function to take in a date format and return array of associated * formats for each date element * * @return array * @param string $str Format * * Example: Y/m/d g:i:s becomes * Array * ( * [year] = If you see the number 86400 in a date calculation, think very hard before deciding that it is correct. In many places, some days have only 82,800 seconds and some have 90,000. Assuming that now plus 86,400 seconds is equivalent to some time tomorrow can sometimes be wrong.

It might actually be the day after tomorrow or still today. Most spreadsheet programs have a rather nice little built-in function called NETWORKDAYS to calculate the number of business days (i.e.

A function not using php's date() function that will also account for this small anomaly in leap years: While is_leapyear_working will not return true for the few non-leap years divisible by four I couldn't tell you if this is more or less efficient than using php's date() as an even earlier poster suggested: The following function will return the date (on the Gregorian calendar) for Orthodox Easter (Pascha).

Note that incorrect results will be returned for years less than 1601 or greater than 2399.

"skip all Fridays and Saturdays but include Sundays") or to set up dates that should always be skipped (e.g.

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