Xamarin.iOSアレコレメモ

NSDate と DateTime の相互変換

NSDate => DateTime

ReferenceDate ってなんなの...（https://developer.apple.com/documentation/foundation/nsdate）

    public static class FoundationExtensions
    {
        public static DateTime ToDateTime(this NSDate date)
        {
            // ref: https://developer.apple.com/documentation/foundation/nsdate
            var referenceDate = new DateTime(2001, 1, 1);
            return referenceDate.AddSeconds(date.SecondsSinceReferenceDate);
        }
    }

        public static NSDate ToNSDate(this DateTime dateTime)
        {
            var universalTime = dateTime.ToUniversalTime();
            var date = NSDate.FromTimeIntervalSinceReferenceDate((universalTime - referenceDate).TotalSeconds);
            return date;
        }