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anaconda875
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Asked: 2022-12-29T07:19:33+00:00 In:

momentjs aws-lambda wrong timezone

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I have this following node js code:

let pureDate = new Date('2022-12-22T00:00:00.000Z')
console.log(pureDate)
let formatted1 = moment(pureDate).format('YYYY-MM-DDTHH:00:00+hh:mm')
console.log(formatted1)
let formatted2 = moment.utc(pureDate).local().format('YYYY-MM-DDTHH:00:00+hh:mm')
console.log(formatted2)

When I run it at my Windows 10 local machine (+07:00), it print to console:

2022-12-22T00:00:00.000Z
2022-12-22T07:00:00+07:00
2022-12-22T07:00:00+07:00

Now I change timezone to +12:00 and rerun the code, it print:

2022-12-22T00:00:00.000Z
2022-12-22T12:00:00+12:00
2022-12-22T12:00:00+12:00

Everything were fine

Now I deploy it to aws lambda using cloudformation:

Resources:
  timerHandler:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src.timerHandler
      Runtime: nodejs16.x
      Environment:
        Variables:
          NODE_ENV: lc
      Timeout: 100
      Events:
        ScheduledEvent:
          Type: Schedule
          Properties:
            Schedule: "rate(15 minutes)"

After sometime, I access the log and see (please scroll to right-end):

2022-12-22T22:47:04.451+07:00   2022-12-22T15:47:04.451Z e55ee401-87fd-4614-a7c6-971973ccccc6 INFO pureDate: 2022-12-22T00:00:00.000Z

2022-12-22T22:47:04.451+07:00   2022-12-22T15:47:04.451Z e55ee401-87fd-4614-a7c6-971973ccccc6 INFO formatted1: 2022-12-22T00:00:00+12:00

2022-12-22T22:47:04.451+07:00   2022-12-22T15:47:04.451Z e55ee401-87fd-4614-a7c6-971973ccccc6 INFO formatted2: 2022-12-22T00:00:00+12:00

The time 00:00:00 is correct, but the zone +12:00 is not. I would expect the formatted should be 2022-12-22T12:00:00+12:00 or 2022-12-22T00:00:00+00:00

This is zone information of the lambda execution:

2022-12-22T23:46:32.052+07:00   2022-12-22T16:46:32.052Z f1d04019-44e7-463a-af1d-faf2a5043887 INFO zone_name: Africa/Abidjan

2022-12-22T23:46:32.052+07:00   2022-12-22T16:46:32.052Z f1d04019-44e7-463a-af1d-faf2a5043887 INFO timezone: GMT

Is that the problem of momentjs, or my code, or lambda? How can I fix it?

moment version: “^2.29.4”

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2 Answers

  1. Enlightened

    I see the final logs was not printed by the first source code:

    let pureDate = new Date('2022-12-22T00:00:00.000Z')
console.log(pureDate)
let formatted1 = moment(pureDate).format('YYYY-MM-DDTHH:00:00+hh:mm')
console.log(formatted1)
let formatted2 = moment.utc(pureDate).local().format('YYYY-MM-DDTHH:00:00+hh:mm')
console.log(formatted2)

    Could you provide the source code of the final logs?

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