"Sun, 11 Jan 1970 09:15:39"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
09:15:39
General datetime
1970-01-11 09:15:39Z
For Database
1970-01-11 09:15:39
For HTTP1.1
Sun, 11 Jan 1970 09:15:39 GMT