"Tue, 06 Jan 1970 04:40:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700106
Only TIME
04:40:23
General datetime
1970-01-06 04:40:23Z
For Database
1970-01-06 04:40:23
For HTTP1.1
Tue, 06 Jan 1970 04:40:23 GMT