"Sat, 03 Jan 1970 07:27:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
07:27:21
General datetime
1970-01-03 07:27:21Z
For Database
1970-01-03 07:27:21
For HTTP1.1
Sat, 03 Jan 1970 07:27:21 GMT