"Tue, 20 Jan 1970 04:38:32"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
04:38:32
General datetime
1970-01-20 04:38:32Z
For Database
1970-01-20 04:38:32
For HTTP1.1
Tue, 20 Jan 1970 04:38:32 GMT