"Sat, 10 Jan 1970 23:38:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
23:38:56
General datetime
1970-01-10 23:38:56Z
For Database
1970-01-10 23:38:56
For HTTP1.1
Sat, 10 Jan 1970 23:38:56 GMT