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We convert quite a bit in our dataset and that is of course all right.

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However if you just need a simple conversion like this one, where you don't specify on error and on null,

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then you can also use a shortcut,

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there are some special operators in mongodb

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and of course you find them in the official docs under aggregation pipeline operators. There you find if

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you scroll down to T, to date, to decimal, to double, to int, to long and so on operators,

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so these are shortcuts if you need to do a specific transformation.

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So in my case here where I don't have on error and on null, I could just say to date here and simply pass

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in the field which holds the date value I want to transform, just like that

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and this will yield the same output as we had before.

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If I execute this, you see we still have an ISO date but now it's a bit shorter,

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so be aware of these shortcuts for simple transformations.

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If you do want to specify your own on error and on null fallback because you might have incomplete data

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in your dataset, then using these shortcuts is a bit more difficult,

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you at least have to check their docs to see if the default value is they will assume are all right

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for you.