"Tue, 20 Jan 1970 14:11:54"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
14:11:54
General datetime
1970-01-20 14:11:54Z
For Database
1970-01-20 14:11:54
For HTTP1.1
Tue, 20 Jan 1970 14:11:54 GMT