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Formatting Requirements
The user's first day and last day fields in the bulk update template have specific requirements in order for the system to accept the update. They are optional fields but, should you choose to you them, they are expected to be filled out in the format YYYY-MM-DD. These cells should be in a date format: the upload may fail or register as an incomplete template if the cell and values aren't entered in the correct format.
How to do this in Excel
Follow the bulk update flow to obtain your import template
Scroll to the column with the header "first_day" and select the column
Enter all dates following the year, month, day format: YYYY-MM-DD
Other helpful resources
If you're looking for more helpful resources on bulk updating users and/or creating bulk imports, please check out the articles below: