"Sun, 04 Jan 1970 23:37:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
23:37:48
General datetime
1970-01-04 23:37:48Z
For Database
1970-01-04 23:37:48
For HTTP1.1
Sun, 04 Jan 1970 23:37:48 GMT