Suppose your date is in A1 of Sheet1, and you want this to be reflected in
D1 of the other sheets - you can do so with this formula:
=Sheet1!$A$1
If you only have a few sheets, then you can copy this to D1 of the other
sheets, but if you have several then you can group those sheets together by
holding the CTRL key and selecting each sheet tab in turn, and then you only
need to enter the formula once and it will automatically go into that cell
in all the sheets which are grouped together. You should Ungroup the sheets
when finished, by right-click on a sheet tab.
Hope this helps.
Pete