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Determine Whether Two Date Ranges Overlap Tests
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namespace ConsoleApplication | |
{ | |
using System; | |
class Program | |
{ | |
/// <param name="args"></param> | |
static void Main(string[] args) | |
{ | |
bool isoverlap; | |
string testResult; | |
DateTime? A = new DateTime(2017, 10, 1); | |
DateTime? B = new DateTime(2017, 10, 10); | |
DateTime? C = null; | |
DateTime? D = null; | |
//#1 | |
Console.WriteLine("SCENARIO#1:"); | |
Console.WriteLine(" A |---------------------| B"); | |
Console.WriteLine(" C |--------| D"); | |
C = A.Value.AddDays(-2); | |
D = A.Value.AddDays(2); | |
Console.ForegroundColor = ConsoleColor.Yellow; | |
isoverlap = isoverlapping(A, B, C, D); | |
testResult = (isoverlap == true) ? "PASSED" : "FAILED"; | |
Console.WriteLine("OVERLAP?: {0}", isoverlap.ToString()); | |
Console.ForegroundColor = (testResult == "PASSED") ? ConsoleColor.Green : ConsoleColor.Red; | |
Console.WriteLine("TEST RESULT: {0}", testResult); | |
Console.ResetColor(); | |
//#2 | |
Console.WriteLine("SCENARIO#2:"); | |
Console.WriteLine(" A |---------------------| B"); | |
Console.WriteLine(" C |--------| D"); | |
C = A.Value.AddDays(2); | |
D = B.Value.AddDays(2); | |
Console.ForegroundColor = ConsoleColor.Yellow; | |
isoverlap = isoverlapping(A, B, C, D); | |
testResult = (isoverlap == true) ? "PASSED" : "FAILED"; | |
Console.WriteLine("OVERLAP?: {0}", isoverlap.ToString()); | |
Console.ForegroundColor = (testResult == "PASSED") ? ConsoleColor.Green : ConsoleColor.Red; | |
Console.WriteLine("TEST RESULT: {0}", testResult); | |
Console.ResetColor(); | |
//#3 | |
Console.WriteLine("SCENARIO#3:"); | |
Console.WriteLine(" A |---------------------| B"); | |
Console.WriteLine(" C |---------------------| D"); | |
C = A; | |
D = B; | |
Console.ForegroundColor = ConsoleColor.Yellow; | |
isoverlap = isoverlapping(A, B, C, D); | |
testResult = (isoverlap == true) ? "PASSED" : "FAILED"; | |
Console.WriteLine("OVERLAP?: {0}", isoverlap.ToString()); | |
Console.ForegroundColor = (testResult == "PASSED") ? ConsoleColor.Green : ConsoleColor.Red; | |
Console.WriteLine("TEST RESULT: {0}", testResult); | |
Console.ResetColor(); | |
//#4 | |
Console.WriteLine("SCENARIO#4:"); | |
Console.WriteLine(" A |---------------------| B"); | |
Console.WriteLine(" C |--------| D"); | |
C = A.Value.AddDays(2); | |
D = B.Value.AddDays(-2); | |
Console.ForegroundColor = ConsoleColor.Yellow; | |
isoverlap = isoverlapping(A, B, C, D); | |
testResult = (isoverlap == true) ? "PASSED" : "FAILED"; | |
Console.WriteLine("OVERLAP?: {0}", isoverlap.ToString()); | |
Console.ForegroundColor = (testResult == "PASSED") ? ConsoleColor.Green : ConsoleColor.Red; | |
Console.WriteLine("TEST RESULT: {0}", testResult); | |
Console.ResetColor(); | |
//#5 | |
Console.WriteLine("SCENARIO#5:"); | |
Console.WriteLine(" A |---------------------| B"); | |
Console.WriteLine(" C |--------| D"); | |
C = A.Value.AddDays(-2); | |
D = A.Value.AddDays(-1); | |
Console.ForegroundColor = ConsoleColor.Yellow; | |
isoverlap = isoverlapping(A, B, C, D); | |
testResult = (isoverlap == false) ? "PASSED" : "FAILED"; | |
Console.WriteLine("OVERLAP?: {0}", isoverlap.ToString()); | |
Console.ForegroundColor = (testResult == "PASSED") ? ConsoleColor.Green : ConsoleColor.Red; | |
Console.WriteLine("TEST RESULT: {0}", testResult); | |
Console.ResetColor(); | |
//#6 | |
Console.WriteLine("SCENARIO#6:"); | |
Console.WriteLine(" A |---------------------| B"); | |
Console.WriteLine(" C |--------| D"); | |
C = B.Value.AddDays(2); | |
D = B.Value.AddDays(3); | |
Console.ForegroundColor = ConsoleColor.Yellow; | |
isoverlap = isoverlapping(A, B, C, D); | |
testResult = (isoverlap == false) ? "PASSED" : "FAILED"; | |
Console.WriteLine("OVERLAP?: {0}", isoverlap.ToString()); | |
Console.ForegroundColor = (testResult == "PASSED") ? ConsoleColor.Green : ConsoleColor.Red; | |
Console.WriteLine("TEST RESULT: {0}", testResult); | |
Console.ResetColor(); | |
//#7 | |
A = new DateTime(2017, 10, 1); | |
B = new DateTime(2017, 10, 1); | |
C = A; | |
D = B; | |
Console.WriteLine("SCENARIO#7: (Same Day for both sets)"); | |
Console.WriteLine(" A || B"); | |
Console.WriteLine(" C || D"); | |
C = B; | |
D = B; | |
Console.ForegroundColor = ConsoleColor.Yellow; | |
isoverlap = isoverlapping(A, B, C, D); | |
testResult = (isoverlap == true) ? "PASSED" : "FAILED"; | |
Console.WriteLine("OVERLAP?: {0}", isoverlap.ToString()); | |
Console.ForegroundColor = (testResult == "PASSED") ? ConsoleColor.Green : ConsoleColor.Red; | |
Console.WriteLine("TEST RESULT: {0}", testResult); | |
Console.ResetColor(); | |
Console.ReadKey(); | |
} | |
static bool isoverlapping(DateTime? A, DateTime? B, DateTime? C, DateTime? D) | |
{ | |
//return ((A.HasValue ? (A < D) : true) && (B.HasValue ? (C < B) : true)); | |
//return !((B.HasValue ? (B <= C) : true) || (A.HasValue ? (A >= D) : true)); | |
return ((A == null || D == null || A <= D) | |
&& (C == null || B == null || C <= B) | |
&& (A == null || B == null || A <= B) | |
&& (C == null || D == null || C <= D)); //or: WORKS!!! | |
//(A <= D) && (A <= B) && (C <= B) && (C <= D) or, | |
//(A <= Min(B, D) && (C <= Min(B, D)) or: | |
//(Max(A, C) <= Min(B, D)); | |
} | |
} | |
} |
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what about d is null and c is smaller than a, getting wrong result.