"Mon, 19 Jan 1970 21:48:53"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
21:48:53
General datetime
1970-01-19 21:48:53Z
For Database
1970-01-19 21:48:53
For HTTP1.1
Mon, 19 Jan 1970 21:48:53 GMT