"Sat, 03 Jan 1970 07:56:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
07:56:21
General datetime
1970-01-03 07:56:21Z
For Database
1970-01-03 07:56:21
For HTTP1.1
Sat, 03 Jan 1970 07:56:21 GMT