"Tue, 06 Jan 1970 00:38:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700106
Only TIME
00:38:20
General datetime
1970-01-06 00:38:20Z
For Database
1970-01-06 00:38:20
For HTTP1.1
Tue, 06 Jan 1970 00:38:20 GMT