"Mon, 19 Jan 1970 21:10:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700119
Only TIME
21:10:48
General datetime
1970-01-19 21:10:48Z
For Database
1970-01-19 21:10:48
For HTTP1.1
Mon, 19 Jan 1970 21:10:48 GMT