"Sun, 04 Jan 1970 07:27:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700104
Only TIME
07:27:48
General datetime
1970-01-04 07:27:48Z
For Database
1970-01-04 07:27:48
For HTTP1.1
Sun, 04 Jan 1970 07:27:48 GMT