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You can modify the format of the timer in Text.DateStyle using SwiftUI by customizing the date components that are displayed. Here's an example:

Text(Date(), style: .timer)
    .font(.system(size: 24))
    .foregroundColor(.blue)
    .onReceive(Timer.publish(every: 1, on: .main, in: .common).autoconnect()) { _ in
        // update the timer every second
    }
    .datePickerStyle(
        WheelDatePickerStyle()
            .datePickerStyleModifier { datePickerStyle in
                datePickerStyle.dateComponents = [.hourAndMinute, .second]
            }
    )

In this example, we're formatting the timer to display only the hours, minutes, and seconds. The .datePickerStyleModifier function is used to customize the date components that are displayed. You can add or remove components as needed to customize the format of the timer.