"Fri, 23 Jan 1970 04:42:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
04:42:42
General datetime
1970-01-23 04:42:42Z
For Database
1970-01-23 04:42:42
For HTTP1.1
Fri, 23 Jan 1970 04:42:42 GMT