"Thu, 01 Jan 1970 20:39:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
20:39:56
General datetime
1970-01-01 20:39:56Z
For Database
1970-01-01 20:39:56
For HTTP1.1
Thu, 01 Jan 1970 20:39:56 GMT