"Sat, 03 Jan 1970 19:44:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
19:44:49
General datetime
1970-01-03 19:44:49Z
For Database
1970-01-03 19:44:49
For HTTP1.1
Sat, 03 Jan 1970 19:44:49 GMT