"Mon, 12 Jan 1970 00:40:16"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
00:40:16
General datetime
1970-01-12 00:40:16Z
For Database
1970-01-12 00:40:16
For HTTP1.1
Mon, 12 Jan 1970 00:40:16 GMT