"Tue, 13 Jan 1970 15:20:26"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
15:20:26
General datetime
1970-01-13 15:20:26Z
For Database
1970-01-13 15:20:26
For HTTP1.1
Tue, 13 Jan 1970 15:20:26 GMT