"Tue, 13 Jan 1970 18:11:35"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
18:11:35
General datetime
1970-01-13 18:11:35Z
For Database
1970-01-13 18:11:35
For HTTP1.1
Tue, 13 Jan 1970 18:11:35 GMT