"Thu, 01 Jan 1970 14:49:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
14:49:21
General datetime
1970-01-01 14:49:21Z
For Database
1970-01-01 14:49:21
For HTTP1.1
Thu, 01 Jan 1970 14:49:21 GMT