"Mon, 05 Jan 1970 18:27:27"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
18:27:27
General datetime
1970-01-05 18:27:27Z
For Database
1970-01-05 18:27:27
For HTTP1.1
Mon, 05 Jan 1970 18:27:27 GMT