"Tue, 20 Jan 1970 11:25:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
11:25:42
General datetime
1970-01-20 11:25:42Z
For Database
1970-01-20 11:25:42
For HTTP1.1
Tue, 20 Jan 1970 11:25:42 GMT