"Fri, 23 Jan 1970 04:34:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
04:34:48
General datetime
1970-01-23 04:34:48Z
For Database
1970-01-23 04:34:48
For HTTP1.1
Fri, 23 Jan 1970 04:34:48 GMT