"Fri, 02 Jan 1970 18:16:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
18:16:42
General datetime
1970-01-02 18:16:42Z
For Database
1970-01-02 18:16:42
For HTTP1.1
Fri, 02 Jan 1970 18:16:42 GMT