"Sun, 04 Jan 1970 20:35:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
20:35:46
General datetime
1970-01-04 20:35:46Z
For Database
1970-01-04 20:35:46
For HTTP1.1
Sun, 04 Jan 1970 20:35:46 GMT