"Sun, 04 Jan 1970 07:49:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
07:49:46
General datetime
1970-01-04 07:49:46Z
For Database
1970-01-04 07:49:46
For HTTP1.1
Sun, 04 Jan 1970 07:49:46 GMT