"Tue, 20 Jan 1970 07:51:35"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
07:51:35
General datetime
1970-01-20 07:51:35Z
For Database
1970-01-20 07:51:35
For HTTP1.1
Tue, 20 Jan 1970 07:51:35 GMT