"Tue, 13 Jan 1970 09:15:37"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
09:15:37
General datetime
1970-01-13 09:15:37Z
For Database
1970-01-13 09:15:37
For HTTP1.1
Tue, 13 Jan 1970 09:15:37 GMT