"Sun, 04 Jan 1970 12:37:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
12:37:55
General datetime
1970-01-04 12:37:55Z
For Database
1970-01-04 12:37:55
For HTTP1.1
Sun, 04 Jan 1970 12:37:55 GMT