Datepart().........to check if date is vallid

[swapna_2008]

Hi

1)I am entering the date in input pox and the passing the value to datepart function
mydate=inputbox("enter the date")/if i enter date as 29/29/29
datepart("d",mydate)/then it should display 29 as date and when i click ok it should display invalid date.but not workin

2)if i use the same for "date" its is workin
datepart("d'",date)//it displays properly.i mean the system date,as date is a key word

Clarification:Can u jus help me in telling wheater the way i am passing the value in 1 is wrong