SOLVED: SwiftUI: How to check if date is in the same Year

@ashleydee1999

Jan '22

Hie, I have a timestamp such as this one: 2022-01-12T17:06:37.000Z which I obviously want to display in a readable format to the end-user. What I do usually is to check if the date is today, if it is then I take the time from the Timestamp and display it. If it isn't then I display the extract the day and month from the Timestamp and display that. Now the issue is some dates are from last year (2021), so what I want to do is check if the date is from the current year, if it isn't then I want to display the day-month-year. My Current Implementation was built last year before I started dealing with dates from the previous year. BTW: the stringDate parameter comes from a REST API response. Below is my current Implementation:

func DateTimeDisplay(_ stringDate: String) -> some View 
{

    let fromReponseDateformatter = DateFormatter()
    let todayDateformatter = DateFormatter()
    let notTodayDateformatter = DateFormatter()
    let notCurrentYearDateformatter = DateFormatter()

    fromReponseDateformatter.calendar = Calendar(identifier: .iso8601)
    fromReponseDateformatter.locale = Locale(identifier: "en_US_POSIX")
    fromReponseDateformatter.timeZone = TimeZone(secondsFromGMT: 0)
    fromReponseDateformatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSXXXXX"

    todayDateformatter.dateFormat = "HH':'mm a"

    todayDateformatter.amSymbol = "AM"
    todayDateformatter.pmSymbol = "PM"

    notTodayDateformatter.dateFormat = "dd'/'MM"

    notCurrentYearDateformatter.dateFormat = "dd'/'MM'/'yyyy" // How do I check this part

    let today = fromReponseDateformatter.date(from: stringDate)

    var message = Text("The date received: \(fromReponseDateformatter.string(from: today!))")

    if Calendar.current.isDateInToday(today!)
    {
        message = Text(todayDateformatter.string(from: today!)).font(Font.custom("Poppins-Regular", size: 15))
            .foregroundColor(Color(red: 171/255, green: 171/255, blue: 171/255))
    }
    else
    {

        message = Text(notTodayDateformatter.string(from: today!)).font(Font.custom("Poppins-Regular", size: 15))
            .foregroundColor(Color(red: 171/255, green: 171/255, blue: 171/255))
    }

    return message

}

I got the below extension, but I'm not sure how to use it:

extension Date {

    func isEqual(to date: Date, toGranularity component: Calendar.Component, in calendar: Calendar = .current) -> Bool {
        calendar.isDate(self, equalTo: date, toGranularity: component)
    }

    func isInSameYear(as date: Date) -> Bool { isEqual(to: date, toGranularity: .year) }
    func isInSameMonth(as date: Date) -> Bool { isEqual(to: date, toGranularity: .month) }
    func isInSameWeek(as date: Date) -> Bool { isEqual(to: date, toGranularity: .weekOfYear) }

    func isInSameDay(as date: Date) -> Bool { Calendar.current.isDate(self, inSameDayAs: date) }

    var isInThisYear:  Bool { isInSameYear(as: Date()) }
    var isInThisMonth: Bool { isInSameMonth(as: Date()) }
    var isInThisWeek:  Bool { isInSameWeek(as: Date()) }

    var isInYesterday: Bool { Calendar.current.isDateInYesterday(self) }
    var isInToday:     Bool { Calendar.current.isDateInToday(self) }
    var isInTomorrow:  Bool { Calendar.current.isDateInTomorrow(self) }

    var isInTheFuture: Bool { self > Date() }
    var isInThePast:   Bool { self < Date() }
}

@roosterboy HWS+

Jan '22

If I'm understanding you correctly, this should do what you want:

func dateTimeDisplay(for stringDate: String) -> String {
    let inFormatter = ISO8601DateFormatter()
    inFormatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
    guard let inDate: Date = inFormatter.date(from: stringDate) else {
        fatalError("date cannot be derived from string \"\(stringDate)\"")
    }

    //default to day and month
    var outTemplate = "dd/MM"

    let cal = Calendar.current

    if cal.isDate(inDate, inSameDayAs: .now) {
        outTemplate = "HH:mm a"
    } else if !cal.isDate(inDate, equalTo: .now, toGranularity: .year) {
        outTemplate += "/yyyy"
    }

    let outFormatter = DateFormatter()
    outFormatter.setLocalizedDateFormatFromTemplate(outTemplate)

    return outFormatter.string(from: inDate)
}

//date is today
print(dateTimeDisplay(for: "2022-01-06T17:06:37.000Z"))
//09:06

//date is in same year
print(dateTimeDisplay(for: "2022-01-12T17:06:37.000Z"))
//01/12

//date is in different year
print(dateTimeDisplay(for: "2021-09-10T09:16:57.030Z"))
//09/10/2021

//incorrect date string
print(dateTimeDisplay(for: "2022-01-06T27:06:37.000Z"))
//fatal error!

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