"Fri, 02 Jan 1970 00:56:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
00:56:21
General datetime
1970-01-02 00:56:21Z
For Database
1970-01-02 00:56:21
For HTTP1.1
Fri, 02 Jan 1970 00:56:21 GMT