"Wed, 14 Jan 1970 21:47:45"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
21:47:45
General datetime
1970-01-14 21:47:45Z
For Database
1970-01-14 21:47:45
For HTTP1.1
Wed, 14 Jan 1970 21:47:45 GMT