"Mon, 12 Jan 1970 18:15:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
18:15:38
General datetime
1970-01-12 18:15:38Z
For Database
1970-01-12 18:15:38
For HTTP1.1
Mon, 12 Jan 1970 18:15:38 GMT