"Mon, 12 Jan 1970 15:12:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
15:12:56
General datetime
1970-01-12 15:12:56Z
For Database
1970-01-12 15:12:56
For HTTP1.1
Mon, 12 Jan 1970 15:12:56 GMT