"Tue, 20 Jan 1970 04:34:45"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
04:34:45
General datetime
1970-01-20 04:34:45Z
For Database
1970-01-20 04:34:45
For HTTP1.1
Tue, 20 Jan 1970 04:34:45 GMT