"Sun, 04 Jan 1970 07:40:04"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
07:40:04
General datetime
1970-01-04 07:40:04Z
For Database
1970-01-04 07:40:04
For HTTP1.1
Sun, 04 Jan 1970 07:40:04 GMT