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Asked: 2026-06-18T10:29:38+00:00

For instance, const d = new Date("2012-08-20T15:00:00-07:00"); d here is a UTC time with

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For instance,

const d = new Date("2012-08-20T15:00:00-07:00");

d here is a UTC time with time offset = 07:00. Does it still require Z like this 2012-08-20T15:00:00-07:00Z? Is this correct?

If I take this string with Z and parse it using Date.parse() method in JavaScript, it throws an error. Not sure what is wrong!

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1 Answer

  1. Editorial Team

    No, you should not include the “Z” with a time zone offset.

    From rfc3339:

      Z           A suffix which, when applied to a time, denotes a UTC
              offset of 00:00; often spoken "Zulu" from the ICAO
              phonetic alphabet representation of the letter "Z".

    The “Z” is a zero time offset, so including it with an explicit offset (especially a non-zero one) doesn’t makes sense.

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