"Tue, 13 Jan 1970 00:02:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
00:02:40
General datetime
1970-01-13 00:02:40Z
For Database
1970-01-13 00:02:40
For HTTP1.1
Tue, 13 Jan 1970 00:02:40 GMT