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  1. using System;
  2. using System.Globalization;
  3. using System.Linq;
  4. using System.Collections.Generic;
  5.  
  6. public class Test
  7. {
  8.  
  9.  
  10. 	public static void Main()
  11. 	{
  12.         var date = new DateTime(2013, 07, 22);
  13.         var posibleDays = new[]{DayOfWeek.Tuesday,DayOfWeek.Wednesday,DayOfWeek.Friday};
  14.         var nearestDay = posibleDays.Select(dow => new { 
  15.             DayOfWeek = dow, 
  16.             Diff = (7 + (dow - date.DayOfWeek)) % 7 
  17.         })
  18.         .Where(x => x.Diff >= 1)
  19.         .OrderBy(x => x.Diff)
  20.         .FirstOrDefault();
  21.         Console.WriteLine("date:{0} nearest:{1} diff:{2}", date.ToString(), nearestDay.DayOfWeek,nearestDay.Diff);
  22.  
  23.         date = new DateTime(2013, 07, 23);
  24.         posibleDays = new[]{DayOfWeek.Tuesday,DayOfWeek.Wednesday,DayOfWeek.Thursday,DayOfWeek.Saturday};
  25.         nearestDay = posibleDays.Select(dow => new { 
  26.             DayOfWeek = dow, 
  27.             Diff = (7 + (dow - date.DayOfWeek)) % 7 
  28.         })
  29.         .Where(x => x.Diff >= 1)
  30.         .OrderBy(x => x.Diff)
  31.         .FirstOrDefault();
  32.         Console.WriteLine("date:{0} nearest:{1} diff:{2}",  date.ToString(), nearestDay.DayOfWeek,nearestDay.Diff);
  33.  
  34.         date = new DateTime(2013, 07, 24);
  35.         posibleDays = new[]{DayOfWeek.Monday, DayOfWeek.Tuesday};
  36.         nearestDay = posibleDays.Select(dow => new { 
  37.             DayOfWeek = dow, 
  38.             Diff = (7 + (dow - date.DayOfWeek)) % 7 
  39.         })
  40.         .Where(x => x.Diff >= 1)
  41.         .OrderBy(x => x.Diff)
  42.         .FirstOrDefault();
  43.         Console.WriteLine("date:{0} nearest:{1} diff:{2}",  date.ToString(), nearestDay.DayOfWeek,nearestDay.Diff);
  44. 	}
  45. }
Success #stdin #stdout 0.08s 34320KB
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stdin
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Standard input is empty
stdout
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date:7/22/2013 12:00:00 AM nearest:Tuesday diff:1
date:7/23/2013 12:00:00 AM nearest:Wednesday diff:1
date:7/24/2013 12:00:00 AM nearest:Monday diff:5
https://ideone.com/VzZnzx
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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