"Fri, 23 Jan 1970 02:16:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
02:16:46
General datetime
1970-01-23 02:16:46Z
For Database
1970-01-23 02:16:46
For HTTP1.1
Fri, 23 Jan 1970 02:16:46 GMT