"Mon, 19 Jan 1970 21:48:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
21:48:56
General datetime
1970-01-19 21:48:56Z
For Database
1970-01-19 21:48:56
For HTTP1.1
Mon, 19 Jan 1970 21:48:56 GMT