node.js - How do I update a property with the current date in a Mongoose schema on every save? -

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in database collections, want update 'lastchanged' field every time record updated current datetime. want in same format mongoose's default date like:

isodate("2011-10-06t14: 01: 31.106z")

any words of wisdom?

if want iso string use:

new date().toisostring()

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