"Tue, 20 Jan 1970 19:43:39"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
19:43:39
General datetime
1970-01-20 19:43:39Z
For Database
1970-01-20 19:43:39
For HTTP1.1
Tue, 20 Jan 1970 19:43:39 GMT