Swift: get total days of DateComponents with a fractional part (including hours, minutes, etc)

total_days_between_dates.swift

//
//  main.swift
//  swift challenges
//
//  Created by Filipp Mikheev on 06.06.22.
//

import Foundation

extension DateComponents {
    var totalDays: Float {
        get {
            return (Float)(day ?? 0)
            + ((Float)(hour ?? 0)
               + ((Float)(minute ?? 0)
                  + ((Float)(second ?? 0)
                     + (Float)(nanosecond ?? 0)/1000)/60)/60)/24
        }
    }
}

// USAGE
let dateComponents = Calendar.current.dateComponents(
    [.day, .hour, .minute, .second, .nanosecond],
    from:start,
    to: end)
print(dateComponents.totalDays)