"Tue, 13 Jan 1970 20:35:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
20:35:49
General datetime
1970-01-13 20:35:49Z
For Database
1970-01-13 20:35:49
For HTTP1.1
Tue, 13 Jan 1970 20:35:49 GMT