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new Date('yyyy-mm-dd') sets timezone to local timezone but new Date('yyyyy-mm-dd') sets timezone to GMT 

new Date("2019-05-29")
Wed May 29 2019 05:30:00 GMT+0530 (India Standard Time)

new Date("11111-05-29")
Mon May 29 11111 00:00:00 GMT+0530 (India Standard Time)

Why does this behavior occur

Gokul
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    See [Differences in assumed time zone](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse#Differences_in_assumed_time_zone) – Herohtar May 30 '19 at 05:18

1 Answers1

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Your first one is creating a UTC date but you're displaying it in your local timezone. From the documentation...

Support for ISO 8601 formats differs in that date-only strings (e.g. "1970-01-01") are treated as UTC, not local

Your second date is being created in your local timezone. The reason for this is because the ISO 8601 standard only supports a 4-digit year (by default), therefore it does not qualify for the above condition.

Phil
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