Numbers automatically change to Date in Microsoft Excel
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Problem
After exporting issues to Excel, custom field values containing numbers are automatically changed to date in Microsoft Excel.
Cause
This is a default behaviour of Microsoft Excel.
Workaround
Change the settings in Microsoft Excel. Refer to the KB from Mircrosoft here - https://support.office.com/en-nz/article/Stop-automatically-changing-numbers-to-dates-452bd2db-cc96-47d1-81e4-72cec11c4ed8