"Tue, 13 Jan 1970 04:35:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
04:35:40
General datetime
1970-01-13 04:35:40Z
For Database
1970-01-13 04:35:40
For HTTP1.1
Tue, 13 Jan 1970 04:35:40 GMT