Hi Philip,
In that case, you need to learn the correct way of describing things. To refer to a textbox necessarily implies the use of a userform or an ActiveX control. If you want to work with cells on a worksheet, don't call them textboxes - call them cells. As you now know, adding a number to a date on a worksheet is very simple. Working with textboxes and userforms is not so simple and the solution is entirely different.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]