"Tue, 20 Jan 1970 15:20:24"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
15:20:24
General datetime
1970-01-20 15:20:24Z
For Database
1970-01-20 15:20:24
For HTTP1.1
Tue, 20 Jan 1970 15:20:24 GMT