"Sat, 21 Mar 1970 12:03:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700321
Only TIME
12:03:02
General datetime
1970-03-21 12:03:02Z
For Database
1970-03-21 12:03:02
For HTTP1.1
Sat, 21 Mar 1970 12:03:02 GMT