"Mon, 12 Jan 1970 20:42:43"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
20:42:43
General datetime
1970-01-12 20:42:43Z
For Database
1970-01-12 20:42:43
For HTTP1.1
Mon, 12 Jan 1970 20:42:43 GMT