"Tue, 20 Jan 1970 15:13:17"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
15:13:17
General datetime
1970-01-20 15:13:17Z
For Database
1970-01-20 15:13:17
For HTTP1.1
Tue, 20 Jan 1970 15:13:17 GMT