"Thu, 12 Mar 1970 12:02:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700312
Only TIME
12:02:56
General datetime
1970-03-12 12:02:56Z
For Database
1970-03-12 12:02:56
For HTTP1.1
Thu, 12 Mar 1970 12:02:56 GMT