"Sun, 01 Feb 1970 02:47:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700201
Only TIME
02:47:13
General datetime
1970-02-01 02:47:13Z
For Database
1970-02-01 02:47:13
For HTTP1.1
Sun, 01 Feb 1970 02:47:13 GMT