"Sun, 01 Feb 1970 00:52:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700201
Only TIME
00:52:55
General datetime
1970-02-01 00:52:55Z
For Database
1970-02-01 00:52:55
For HTTP1.1
Sun, 01 Feb 1970 00:52:55 GMT