What is the updateDate field in Issue web API response (/api/issues/search)

I need to get details about updateDate field in the Issue web API response. The response from (/api/issues/search). In which scenarios this field will be updated?

Hi,

Welcome to the community!

I believe this field is updated mainly for manual actions (comments & user updates e.g. via the UI). It’s probably also updated if the issue is closed or re-opened by analysis.

 
HTH,
Ann