"Tue, 06 Jan 1970 04:40:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700106
Only TIME
04:40:20
General datetime
1970-01-06 04:40:20Z
For Database
1970-01-06 04:40:20
For HTTP1.1
Tue, 06 Jan 1970 04:40:20 GMT