"Tue, 13 Jan 1970 07:56:57"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
07:56:57
General datetime
1970-01-13 07:56:57Z
For Database
1970-01-13 07:56:57
For HTTP1.1
Tue, 13 Jan 1970 07:56:57 GMT