"Sat, 03 Jan 1970 19:41:37"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
19:41:37
General datetime
1970-01-03 19:41:37Z
For Database
1970-01-03 19:41:37
For HTTP1.1
Sat, 03 Jan 1970 19:41:37 GMT