Swift DateFormatter returning tomorrow's date even after setting the Locale and Timezone

Question

I'm using DateFormatter from Swift to show date to users in "yyyy.MM.dd" format. I find one thing very strange that even after I've set the Timezone, it gives me the date a day after.

let formatter = DateFormatter()
formatter.dateFormat = "yyyy.MM.dd"
formatter.locale = Locale(identifier: "ko_kr")
formatter.timeZone = TimeZone(abbreviation: "KST")

let date = formatter.string(from: myDate)

myDate above is like 2023-06-29 18:25:13 +0000 For example, today is 2023.06.29 and it should return 2023.06.29 but it returns 2023.06.30.

Is there any other parts that I should look into?

2023-06-29 18:25:13 +0000 is indeed 2023-06-30 in Korea. Try adding 9 hours (Korea's offset) to 18:25:13. It'd go into the next day. — Sweeper
– Sweeper, Commented Jun 29, 2023 at 9:34
@Sweeper Hi thanks for the comment. Then is it possible even without setting the timezone, the device itself sets the timezone to KST? Because it had same issue without the timezone code. — hyo
– hyo, Commented Jun 30, 2023 at 0:39
Yeah, IIRC if your device is in KST, then it is automatically set to KST. — Sweeper
– Sweeper, Commented Jun 30, 2023 at 0:43
@Sweeper Oh now I understand. I see the mistake now. Thanks! — hyo
– hyo, Commented Jun 30, 2023 at 0:46

Anton Agafonov · Accepted Answer · 2023-06-29 10:35:22Z

0

You can set the defaultTimeZone property of the DateFormatter explicitly to the desired time zone (KST) using the TimeZone(abbreviation: "KST"). This ensures that the DateFormatter consistently uses the specified time zone when formatting the date, instead of relying on the device's default time zone.

    if let timeZone = TimeZone(abbreviation: "KST") {
    formatter.defaultTimeZone = timeZone
}

answered Jun 29, 2023 at 10:35

Anton Agafonov

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Rajni Bajaj · Accepted Answer · 2023-06-29 12:14:01Z

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There is no issue with the above code. I have tried with all the possible cases but the above code is returning the correct date.

answered Jun 29, 2023 at 12:14

Rajni Bajaj

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