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Try to use Custom Formatting with mm/dd/yyyy and see if this works for you.
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Try to use Custom Formatting with mm/dd/yyyy and see if this works for you.

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Thank you Rob! That was it. &nbsp;User is a happy camper now.
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Thank you Rob! That was it.  User is a happy camper now.

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<blockquote>
His date format defaults to using commas, and I cannot set it to use forward slashes.
</blockquote>
<br />
Because of your above statement, I thought that you are not allowed to change the regional date settings that's why I offered you that solution.<br />
<br />
I think Rob guessed you correctly.
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> His date format defaults to using commas, and I cannot set it to use forward slashes.


Because of your above statement, I thought that you are not allowed to change the regional date settings that's why I offered you that solution.

I think Rob guessed you correctly.

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<div class="content wysiwyg-content">
One of our users on Windows 8.1 using Excel 2010 is not able to change the date formatting in an existing Excel spreadsheet. &nbsp;His date format defaults to using commas, and I cannot set it to use forward slashes. I have tried changing to a different language within Excel, and back to English US with no resolution. (Please see attached screen shot) &nbsp;I have the same operating system and also have Excel 2010, and the same spreadsheet opens fine on my machine with the dates showing up as they should with the forward slashes. <br />
<br />
I'm guessing there is a simple setting somewhere in Excel to fix this. &nbsp;Any help would be appreciated! &nbsp;<br />
<br />
Thank you.<br />
<a href="https://filedb.experts-exchange.com/incoming/2015/08_w34/930307/comma-dates.png" target="_blank" class="file-inline" title="Screen shot of user machine with issue with dates in Excel 2010 (81 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>comma-dates.png</a>
</div>
</div>


Screen shot of user machine with issue with dates in Excel 2010

comma-dates.png

One of our users on Windows 8.1 using Excel 2010 is not able to change the date formatting in an existing Excel spreadsheet.  His date format defaults to using commas, and I cannot set it to use forward slashes. I have tried changing to a different language within Excel, and back to English US with no resolution. (Please see attached screen shot)  I have the same operating system and also have Excel 2010, and the same spreadsheet opens fine on my machine with the dates showing up as they should with the forward slashes. 

I'm guessing there is a simple setting somewhere in Excel to fix this.  Any help would be appreciated!  

Thank you.

Excel 2010 - Cannot set dates to use forward slashes

Microsoft Excel topics include formulas, formatting, VBA macros and user-defined functions, and everything else related to the spreadsheet user interface, including error messages.

Microsoft Excel

Windows 8 is a personal computer operating system developed by Microsoft as part of the Windows NT family of operating systems, with an emphasis on improving its user experience on tablets. In particular, these changes included a touch-optimized Windows shell based on Microsoft's "Metro" design language, the Start screen, a new platform for developing apps with an emphasis on touchscreen input, integration with online services, support for USB 3.0, Advanced Format hard drives, near field communications, and cloud computing. Additional security features were introduced, such as built-in antivirus software, integration with Microsoft SmartScreen phishing filtering service and support for UEFI Secure Boot on supported devices with UEFI firmware.

Windows 8

A spreadsheet is an interactive computer application program for organization, analysis and storage of data in tabular form. Spreadsheets developed as computerized simulations of paper accounting worksheets. The program operates on data represented as cells of an array, organized in rows and columns. Each cell of the array may contain either numeric or text data, or the results of formulas that automatically calculate and display a value based on the contents of other cells.