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https://www.php.net/manual/en/function.mktime.php
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 2038-01-18T22:14:07-0500Z, regardless of whether you're passing it to mktime() or gmmktime().
https://www.tutorialspoint.com/php/php_function_mktime.htm
PHP mktime() Function, The mktime function accepts hours, minutes, seconds, month, day, year as parameters (representing a date) and returns the Unix timestamp for the given date. if
https://www.w3resource.com/php/function-reference/mktime.php
The mktime () function returns the Unix timestamp for a date. Whether Daylight Saving Time is active (values 1 or 0 ). In PHP 5.1.0, this parameter became deprecated. As a result, the new timezone handling features should be used instead. The Unix timestamp corresponding to the parameters given. If the parameters are invalid, the function ...
https://www.w3schools.com/php/func_date_mktime.asp
PHP Version: 4+ PHP Changelog: PHP 7.1: The is_dst parameter is removed. PHP 5.3.0: Throws E_DEPRECATED if the is_dst parameter is used PHP 5.1: The is_dst parameter was deprecated. If mktime() is called with no arguments, it now throws E_STRICT notice. Use the time() function instead.
https://bugs.php.net/9998
using mktime() one day per year has 25 hours in it if you substract one date from the previous day and divide by 3600 you should find there are 24 hours in that day. however, one day per year has 25 hours. so far i have found one day per year. and a different day every year.
https://www.thoughtco.com/use-mktime-to-create-countdown-2693921
How to Code the Countdown Timer. Set a target date. For example, use February 10th, 2017. Do that with this line, which follows the syntax : mktime (hour,minute,second,month,day,year: ist _dst). Since the timestamp is measured in seconds, convert the results into whatever units you want. For hours, divide by 3600.
https://stackoverflow.com/questions/8552106/adding-1-hour-to-time-variable
e.g. 2012-03-02 23:33:33 would become 2014-01-13 13:00:00 by adding 3600 better use mktime and date functions they can handle this and things like adding 25 hours etc. Share Follow
https://www.php.net/manual/en/function.time.php
The function time () returns always timestamp that is timezone independent (=UTC). Local time as string can be get by strftime () and local timestamp (if ever needed) by mktime (). The number of 86,400 seconds in a day comes from the assumption of 60 seconds per minute, 60 minutes per hour and 24 hours per day: 60*60*24.
https://www.tutorialspoint.com/c_standard_library/c_function_mktime.htm
struct tm { int tm_sec; /* seconds, range 0 to 59 */ int tm_min; /* minutes, range 0 to 59 */ int tm_hour; /* hours, range 0 to 23 */ int tm_mday; /* day of the month, range 1 to 31 */ int tm_mon; /* month, range 0 to 11 */ int tm_year; /* The number of years since 1900 */ int tm_wday; /* day of the week, range 0 to 6 */ int tm_yday; /* day in ...
https://stackoverflow.com/questions/3108591/calculate-number-of-hours-between-2-dates-in-php
How do I calculate the difference between two dates in hours? For example: day1=2006-04-12 12:30:00 day2=2006-04-14 11:30:00 In this case the result should be 47 hours.
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