SOLVED: Date formatting seems to be adding one day.

@flaneur7508

Jan '23

Hello, I have a strange problem with dates.

In the code below yyyy-MM-dd'T'HH:mm:ss.SSSSZ = 2023-01-07T23:01:00.341533Z But the formated date analysisProjects.apDateLaunchedUnformatted[apCrawlNo] prints out as 20230108 i.e. one day later.

Any idea what i'm doing wrong here?


        // Generate the unformated short date launched
        dateFormatterToDate.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSSZ"
        if let date = dateFormatterToDate.date(from: isoDate) {
            let dateFormatterToString = DateFormatter()
            dateFormatterToString.dateFormat = "YYYYMMDD"
            analysisProjects.apDateLaunchedUnformatted[apCrawlNo] = dateFormatterToString .string(from: date)
        }

@NigelGee HWS+

Jan '23

see post Converting a string to a date

@roosterboy HWS+

Jan '23

Dates are stored as UTC. Formatted dates are localized. Check that 2023-01-07T23:01:00.341533Z in UTC isn't actually 2023-01-08 in your local time zone. If you don't want the formatted string to be localized, you will need to supply a fixed locale, like en_US_POSIX.

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