"Fri, 16 Jan 1970 04:42:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700116
Only TIME
04:42:38
General datetime
1970-01-16 04:42:38Z
For Database
1970-01-16 04:42:38
For HTTP1.1
Fri, 16 Jan 1970 04:42:38 GMT