departure time : data type must be "date"

1)Time should be in ds format hh:ss.
2)Departure time should be greater than the arrival time.
3)accept only the valid time.

different formats like
12 hour format
24 hour format.
positive test data
< 24 in hour filed(incase of 24 hour format)
< 12 in hour field(incase of 12 hour format)
< 60 in minute field
negative test data
> 24 in hour filed(incase of 24 hour format)
> 12 in hour field(incase of 12 hour format)
> 60 in minute field
check for special character entries in the test field.
alpha numeric combinations

positive testing:(it should accept)
>hrs less than 24 like 21(incase of 24 hrs format)
>hrs less than equal to 12 like 11(incase of 12 hrs format)
>mins less than 59 like 56...
>secs less than 59 like 45..
negative testing:(error should be generated)
< hrs greater than 24 like 25 (incase of 24 hrs input)
>hrs greater than 12 like 13(incase of 12 hrs format)
>mins greater than 59 like 65...
>secs greater than 59 like 70..
 departure time should be greater than arrival time
try inserting alphanumerics and special char

Check the Time when date is going to change and time of 
depart is going to next date and arrival time is set to 
Previous date eg: arrival time is--11:58
                  depart time is---00:05