How populate date field based on another date field

I have three fields on a form.  The first one is a date field which is always the first date of the current month . For example 4/1/2015.

The second field is a number field.  If the user enters, for example, a "6" in the field, I want the third field (a date field) to populate with the first of the month 12 months from now.

The 12 is the "6" entered x 2.  It will always be the number entered x 2.

What would the afterupdate event code of the number field be?
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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
Me.YourThirdField = DateAdd("m", Me.YourSecondField * 2, CDate(Me.YourDateField))

This would fail if, for example, there is no Date in "YourDateField", so you might check for these things first.

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