Custom field which will capture Date and Time stamp when given condition satisfies

[Rakesh N]

All,

I need to create one custom field in JIRA which will capture Date and Time when value of other three fields set to '1'.

Details:

So whenever drop down of "Prioritization Business Impact", "Prioritization Severity" and "Prioritization Work Around" set to "1", new field should capture date & time of that moment.

How can I do this?

Thank You.