Parse English textual datetimes into Unix timestamps:
The strtotime() function parses an English textual datetime into a Unix timestamp (the number of seconds since January 1 1970 00:00:00 GMT).
Note: If the year is specified in a two-digit format, values between 0-69 are mapped to 2000-2069 and values between 70-100 are mapped to 1970-2000.
Note: Be aware of dates in the m/d/y or d-m-y formats; if the separator is a slash (/), then the American m/d/y is assumed. If the separator is a dash (-) or a dot (.), then the European d-m-y format is assumed. To avoid potential errors, you should YYYY-MM-DD dates or date_create_from_format() when possible.
|time||Required. Specifies a date/time string|
|now||Optional. Specifies the timestamp used as a base for the calculation of relative dates|
|Return Value:||Returns a timestamp on success. FALSE on failure|
|Changelog:||PHP 5.3.0: Now relative time formats such as this week, previous week,
last week, and next week interprets a week period of Monday through Sunday,
rather then a 7-day period relative to the current date/time
PHP 5.3.0: Now 24:00 is a valid format
PHP 5.2.7: In earlier versions, if requesting a given occurrence of a given weekday in a month where that weekday was the first day of the month it would incorrectly add one week to the returned timestamp. This has been corrected now
PHP 5.1.0: Returns FALSE on failure (earlier versions returns -1), and issues E_STRICT and E_NOTICE time zone errors
PHP 5.0.2: Now correctly computes "now" and other relative times from current time, not from today's midnight
PHP 5.0.0: Allows microseconds (but they are ignored)