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toISOString shouldn't return "Invalid Date" when called on a invalid moment #3632

andjd opened this Issue Nov 30, 2016 · 2 comments


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andjd commented Nov 30, 2016

Because ISO dates are typically not used for direct human consumption and rather as a data interchange format, returning the string "Invalid Date" isn't very useful. Throwing a RangeError (which the native JS date object does) or returning null or would be more useful.

Description of the Issue and Steps to Reproduce:
create an invalid moment object (e.g. moment(null) or moment("0000-00-00"))
call toISOString on the invalid moment
see the string 'Invalid Date' is returned


Chrome on Fedora


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icambron commented Dec 4, 2016

I think returning null is probably reasonable here.


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maggiepint commented Jan 9, 2017

Closed in favor of #3710

@maggiepint maggiepint closed this Jan 9, 2017

ichernev added a commit that referenced this issue Mar 2, 2017

Merge pull request #3710 from moment:maggie/isostringnull
[bugfix] Fixes #3632, toISOString returns null for invalid date
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