"Tue, 13 Jan 1970 18:27:34"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
18:27:34
General datetime
1970-01-13 18:27:34Z
For Database
1970-01-13 18:27:34
For HTTP1.1
Tue, 13 Jan 1970 18:27:34 GMT