"Mon, 05 Jan 1970 12:31:39"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
12:31:39
General datetime
1970-01-05 12:31:39Z
For Database
1970-01-05 12:31:39
For HTTP1.1
Mon, 05 Jan 1970 12:31:39 GMT