Ling column label in Pivot table

HI All I am wondering if there is a way of linking the column Label in a pivot table,
I have 3 pivot tables with similar data in each one. The data in the column label is basically the same, end of the month date.
I would have to change all 3 pivot tables so that they are reporting the same period. and it gets tiring and some time i forget to make the identical changes. Has some thought of a macro to to do?