"Mon, 12 Jan 1970 11:21:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
11:21:20
General datetime
1970-01-12 11:21:20Z
For Database
1970-01-12 11:21:20
For HTTP1.1
Mon, 12 Jan 1970 11:21:20 GMT