How to convert date to timestamp in php

The way PHP converts dates into timestamps is: You can use the strtotime() function to achieve this. This function can parse any string datetime description into a Unix timestamp, returning FALSE on failure. The specific usage method is: [strtotime("2009-10-21 16:00:10")].

strtotime() function parses any string datetime description into a Unix timestamp (number of seconds since January 1 1970 00:00:00 GMT ), returns the timestamp if successful, and returns FALSE if failed.

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Grammar format:

int strtotime ( string $time [, int $now = time() ] )

Parameter description:

• time is required. Specifies a date/time string.

• now Optional. Specifies the timestamp used to calculate the return value. If this parameter is omitted, the current time is used.

Code implementation:

<?php
echo strtotime("2009-10-21 16:00:10");
//输出 1256112010
echo strtotime("10 September 2008");
//输出 1220976000
echo strtotime("+1 day"), "<br />";//输出明天此时的时间戳
?>

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