"Fri, 02 Jan 1970 18:15:51"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
18:15:51
General datetime
1970-01-02 18:15:51Z
For Database
1970-01-02 18:15:51
For HTTP1.1
Fri, 02 Jan 1970 18:15:51 GMT