"Fri, 16 Jan 1970 09:15:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700116
Only TIME
09:15:38
General datetime
1970-01-16 09:15:38Z
For Database
1970-01-16 09:15:38
For HTTP1.1
Fri, 16 Jan 1970 09:15:38 GMT