how to valid these when user enter the value into the textbox

[NinjaTurtle]

dear,
how to valid value that user enter into the textbox???

1. valid email address(i know this)
2. valid date
3. valid time
4. valid Integer
5. valid cannot be blank.

is there any code that can share used by all, i dun want to retype the same code 4 different form... any?