"Fri, 16 Jan 1970 15:12:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700116
Only TIME
15:12:40
General datetime
1970-01-16 15:12:40Z
For Database
1970-01-16 15:12:40
For HTTP1.1
Fri, 16 Jan 1970 15:12:40 GMT