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Enter same data in multiple cells

Windows shortcut 
CtrlEnter
Mac shortcut 
Return

With multiple cells selected, this shortcut will enter the same data in all cells in the selection at once. This is a great way to skip a copy & paste step. Cells do not need to be contiguous; use Control (Win) or Command (Mac) to select non-contiguous cells before using Control + Enter.

Related videos

The videos below demonstrate this shortcut.
Although you can use Excel's AutoFill feature to fill in a series of dates and times, you can also do the same thing with formulas. The advantage of using a formula is that can easily change the starting value and generate a new series. Let's take a look.
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In this video, we look at how to use the REPT function, a special function for repeating text values with a numeric counter.