"Sat, 21 Feb 1970 12:02:59"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700221
Only TIME
12:02:59
General datetime
1970-02-21 12:02:59Z
For Database
1970-02-21 12:02:59
For HTTP1.1
Sat, 21 Feb 1970 12:02:59 GMT