"Mon, 12 Jan 1970 09:15:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
09:15:48
General datetime
1970-01-12 09:15:48Z
For Database
1970-01-12 09:15:48
For HTTP1.1
Mon, 12 Jan 1970 09:15:48 GMT