How to fill date by week in Excel quickly and easily?
In Excel, autofill date must be usually used in our daily work, but in this case, I will talk about how to fill dates by week. In other words, I define the start date as 3/1/2016 (Tuesday) and fill it in Cell A1, and I need to fill 3/8/2016 (Tuesday) in Cell A2, 2016/3/15 (Tuesday) in Cell A3, …, etc.
Autofill date weekly with formula
Autofill date weekly/monthly/yearly with Kutools for Excel 
Autofill date weekly with formula
To fill date weekly, you can apply a simple formula.
1. Select a cell and type the start date. In our case, we type 3/1/2016 in Cell A1. See screenshot:
2. Then in the next cell, A2, type this formula =A1+7, and press Enter key to get the second date. See screenshot:
And now you can drag the Cell A2’s autofill handle down to fill dates weekly as you need. See screenshot:
Autofill date weekly/monthly/yearly with Kutools for Excel
If you have Kutools for Excel, with its Insert Sequence Number utility, you can not only fill date weekly, you can also specify the end date when you fill cells.
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After installing Kutools for Excel, please do as below:（Free Download Kutools for Excel Now!)
1. Type the start date into a cell, take A1 for instance, and then select this date and click Home tab, and go to specify this date as General formatting from the list in the Number group on the Home tab. See screenshot:
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2. Then click Kutools > Insert > Insert Sequence Number. See screenshot:
3. In the popping dialog, click New button to create a new sequence. See screenshot:
4. Then type the start date (the number series) into the Start number textbox, and enter 7 into Increment textbox, and 5 into the No.of digits textbox. See screenshot:
5. Click Add to finish the new sequence creation, and then select a range of cells you want to fill dates by week, and click Fill Range. See screenshot:
Tip: You can close the Insert Sequence Number dialog box as you need after inserting the dates weekly.
6. Keep the dates selected, and click Home > Number Format box > Short Date to format the number as date formatting.
Tip:
1. With Insert Sequence Number, you specify the end date when you insert the dates. For instance I specify the end date is 6/18/2016, which can be displayed as 42539. And when you insert dates in will end with 6/18/2016.
2. And you also can reset the sequence number, just need to click Reset, the sequence will be reset and fill number from the start number.
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