"Mon, 05 Jan 1970 21:39:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
21:39:55
General datetime
1970-01-05 21:39:55Z
For Database
1970-01-05 21:39:55
For HTTP1.1
Mon, 05 Jan 1970 21:39:55 GMT