"Sat, 03 Jan 1970 02:28:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
02:28:21
General datetime
1970-01-03 02:28:21Z
For Database
1970-01-03 02:28:21
For HTTP1.1
Sat, 03 Jan 1970 02:28:21 GMT