"Mon, 05 Jan 1970 02:27:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
02:27:20
General datetime
1970-01-05 02:27:20Z
For Database
1970-01-05 02:27:20
For HTTP1.1
Mon, 05 Jan 1970 02:27:20 GMT