Parameters

Description:

Convert a date string to number of seconds since January 1, 1970.
This function returns the number of seconds since January 1st 1970 in the UTC time zone, for the date and time that the datestring parameter specifies.

A "date" is a string containing several items separated by whitespace. The order of the items is immaterial. A date string may contain many flavors of items:
calendar date items Can be specified several ways. Month names can only be three-letter english abbrivations, numbers can be zero-prefixed and the year may use 2 or 4 digits. Examples: 06 Nov 1994, 06-Nov-94 and Nov-94 6.
time of the day items This string specifies the time on a given day. You must specify it with 6 digits with two colons: HH:MM:SS. To not include the time in a date string, will make the function assume 00:00:00. Example: 18:19:21.
time zone items Specifies international time zone. There are a few acronyms supported, but in general you should instead use the specific relative time compared to UTC. Supported formats include: -1200, MST, +0100.
day of the week items Specifies a day of the week. Days of the week may be spelled out in full (using english): `Sunday', `Monday', etc or they may be abbreviated to their first three letters. This is usually not info that adds anything.
pure numbers If a decimal number of the form YYYYMMDD appears, then YYYY is read as the year, MM as the month number and DD as the day of the month, for the specified calendar date.

EXAMPLES
Sun, 06 Nov 1994 08:49:37 GMT
Sunday, 06-Nov-94 08:49:37 GMT
Sun Nov 6 08:49:37 1994
06 Nov 1994 08:49:37 GMT
06-Nov-94 08:49:37 GMT
Nov 6 08:49:37 1994
06 Nov 1994 08:49:37
06-Nov-94 08:49:37
1994 Nov 6 08:49:37
GMT 08:49:37 06-Nov-94 Sunday
94 6 Nov 08:49:37
1994 Nov 6
06-Nov-94
Sun Nov 6 94
1994.Nov.6
Sun/Nov/6/94/GMT
Sun, 06 Nov 1994 08:49:37 CET
06 Nov 1994 08:49:37 EST
Sun, 12 Sep 2004 15:05:58 -0700
Sat, 11 Sep 2004 21:32:11 +0200
20040912 15:05:58 -0700
20040911 +0200