"Sun, 11 Jan 1970 12:31:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
12:31:55
General datetime
1970-01-11 12:31:55Z
For Database
1970-01-11 12:31:55
For HTTP1.1
Sun, 11 Jan 1970 12:31:55 GMT