CSV import in Jira cloud shows all dates as January

Summary

When using the CSV importer in Jira Cloud, all date fields incorrectly display the month as January.

Diagnosis

After you run a CSV import in Jira Cloud, all the date fields in work items that were changed by the import show the month as January.

Cause

The month format is mm instead of MM

This happens when the date format is set as mm/dd/yyyy, where mm is used to represent minutes, not Months (MM). The importer will default the month to January.

Solution

Fix the date format in the import

The date format needs to adhere to Java's SimpleDateFormat.

Check that you are using the correct date format during the CSV import, one that matches the format in the CSV file. For example, the correct date format for 06/23/2025 is MM/dd/yyyy.