#php strtotime function

[websourceblog]

Working with dates in PHP.

PHP date and strtotime functions to get last week first date and last date, last month’s first date and last date, add and minus in date.

[freewebmentor]

PHP strtotime function with the example - FreeWebMentor

The strtotime() function is a built-in function in PHP. This function will change the textual DateTime into a Unix timestamp as per your requirement.