"Sun, 04 Jan 1970 07:37:52"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
07:37:52
General datetime
1970-01-04 07:37:52Z
For Database
1970-01-04 07:37:52
For HTTP1.1
Sun, 04 Jan 1970 07:37:52 GMT