"Mon, 05 Jan 1970 20:39:34"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
20:39:34
General datetime
1970-01-05 20:39:34Z
For Database
1970-01-05 20:39:34
For HTTP1.1
Mon, 05 Jan 1970 20:39:34 GMT