"Sun, 04 Jan 1970 19:40:57"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
19:40:57
General datetime
1970-01-04 19:40:57Z
For Database
1970-01-04 19:40:57
For HTTP1.1
Sun, 04 Jan 1970 19:40:57 GMT