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How do I convert a property in MongoDB from text to date type?

In MongoDB, I have a document with a field called "ClockInTime" that was imported from CSV as a string.

What does an appropriate db.ClockTime.update() statement look like to convert these text based values to a date datatype?

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This code should do it:

> var cursor = db.ClockTime.find()
> while (cursor.hasNext()) {
... var doc = cursor.next();
... db.ClockTime.update({_id : doc._id}, {$set : {ClockInTime : new Date(doc.ClockInTime)}})
... }

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