"Fri, 02 Jan 1970 00:39:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
00:39:46
General datetime
1970-01-02 00:39:46Z
For Database
1970-01-02 00:39:46
For HTTP1.1
Fri, 02 Jan 1970 00:39:46 GMT