"Fri, 16 Jan 1970 04:36:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700116
Only TIME
04:36:20
General datetime
1970-01-16 04:36:20Z
For Database
1970-01-16 04:36:20
For HTTP1.1
Fri, 16 Jan 1970 04:36:20 GMT