"Tue, 27 Jan 1970 18:15:47"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700127
Only TIME
18:15:47
General datetime
1970-01-27 18:15:47Z
For Database
1970-01-27 18:15:47
For HTTP1.1
Tue, 27 Jan 1970 18:15:47 GMT