Convert unix timestamp to Date failed.

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Created Feb ’24

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I get and int unix timestamp from database and convert it to timeinterval as some instructions said. But the result date is not correct. the code is as follows:

                let dateValue = try join.get(examDate);
                print (dateValue)
                let timeInterval = TimeInterval(dateValue);
                print(timeInterval)
                let date = Date(timeIntervalSince1970: timeInterval)
                print(date)

the result is as follows:

1709942400000
1709942400000.0
56155-12-02 00:00:00 +0000

by converting 1709942400000 with js Date, we got the value:

>new Date(1709942400000)
2024-03-09T00:00:00.000Z

How can I properly convert unix timestamp to Date object?

Thanks in advance.

Answered by endecotp in 780314022

1709942400000 is milliseconds since 1970, not seconds. Traditional "unix timestamp" values are in seconds; that is what the objC/Swift Date constructor timeIntervalSince1970 is expecting. In contrast the Javascript Date constructor takes milliseconds. If you divide the value by 1000 you'll get the right answer.

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endecotp OP

Feb ’24

Accepted Answer

1709942400000 is milliseconds since 1970, not seconds. Traditional "unix timestamp" values are in seconds; that is what the objC/Swift Date constructor timeIntervalSince1970 is expecting. In contrast the Javascript Date constructor takes milliseconds. If you divide the value by 1000 you'll get the right answer.

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