"Sun, 04 Jan 1970 15:06:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
15:06:55
General datetime
1970-01-04 15:06:55Z
For Database
1970-01-04 15:06:55
For HTTP1.1
Sun, 04 Jan 1970 15:06:55 GMT