"Mon, 05 Jan 1970 15:20:43"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
15:20:43
General datetime
1970-01-05 15:20:43Z
For Database
1970-01-05 15:20:43
For HTTP1.1
Mon, 05 Jan 1970 15:20:43 GMT