how to maintain default values for custom table fields -- Urgent

Hi all,

I've a requirement wherein i need to create a Z table (with maintainence view) in which i'll have date and time as two of its field which should have current date and current time as default value. Can somebody suggest as how am i to maintain the date and time fields defaulting to current date and current time.

Incase if someone is unable to intrepret what i'm trying to say, please query me, i'll elaborate it further.

Please give in your quick inputs which is highly valuable to me and also will be highly appreciated.

Thanks in advance,

Vaishnavi Varadarajan