If a couple breaks up, then gets back together– does the date/anniversary change or stay the same?

so i and my boyfriend got together January 15, and broke up April 5. we were off for 5 months, but always kept in contact. we just got back together September 20. would our anniversary change to September 20 or stay as January 15? thaank you.
If a couple breaks up, then gets back together– does the date/anniversary change or stay the same?
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