Initialize Date Variables??

[unackvi]

If I need to set the date variable to null OR initialize, what's the format...for other types its easy e.g. we just set it to 0 for integer/long and for string to ''.
I have these date fields on my datawindow, under a particular condition I need to clear them and I don't know how.
thanks,
unackvi

 

[mbalent]

date ld_mydate // at this point the date is '01-01-1900'

Setnull(ld_date) // now the date is null