"Mon, 19 Jan 1970 12:03:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
12:03:13
General datetime
1970-01-19 12:03:13Z
For Database
1970-01-19 12:03:13
For HTTP1.1
Mon, 19 Jan 1970 12:03:13 GMT