Added custom DateFormat

BackupEssentials/Sys/UI/DateFormat.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Globalization;
+
+namespace BackupEssentials.Sys.UI{
+    public class DateFormat{
+        private static readonly DateTime ExampleDate = new DateTime(2015,8,15,22,1,0);
+        
+        private readonly DateTimeFormatInfo FormatProvider;
+        private readonly string _format;
+        private readonly string _example;
+
+        public string Format { get { return _format; } }
+        public string Display { get { return _example; } }
+
+        public DateFormat(CultureInfo culture){
+            FormatProvider = culture.DateTimeFormat;
+            this._format = FormatProvider.ShortDatePattern+" "+FormatProvider.ShortTimePattern;
+            this._example = ParseDate(ExampleDate);
+        }
+
+        public DateFormat(string format){
+            string[] formatSplit = format.Split(new char[]{ ' ' },2);
+            if (formatSplit.Length != 2)throw new ArgumentException("Invalid date/time format: "+format);
+
+            FormatProvider = new DateTimeFormatInfo();
+            FormatProvider.ShortDatePattern = formatSplit[0];
+            FormatProvider.ShortTimePattern = formatSplit[1];
+            
+            this._format = format;
+            this._example = ParseDate(ExampleDate);
+        }
+
+        public string ParseDate(DateTime dt){
+            return dt.ToString("d",FormatProvider)+" "+dt.ToString("t",FormatProvider);
+        }
+
+        public override bool Equals(object obj){
+            DateFormat format = obj as DateFormat;
+            return format != null && format.Format.Equals(Format);
+        }
+
+        public override int GetHashCode(){
+            return Format.GetHashCode();
+        }
+
+        public class Detect : DateFormat{
+            public new string Display { get { return "Detect ("+_example+")"; } }
+
+            public Detect() : base(CultureInfo.CurrentCulture){}
+        }
+    }
+}