From 8ce475dc176652513e48ebd2716bc04861eb26bd Mon Sep 17 00:00:00 2001
From: Gonzalo Diaz <devel@gon.cl>
Date: Wed, 22 May 2024 18:24:26 -0400
Subject: [PATCH] =?UTF-8?q?[Hacker=20Rank]:=20Warmup:=20Time=20Conversion?=
 =?UTF-8?q?=20solved=20=E2=9C=93?=
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---
 .../hackerrank/warmup/TimeConversion.Test.cs  | 29 ++++++++++
 .../src/hackerrank/warmup/TimeConversion.cs   | 34 ++++++++++++
 docs/hackerrank/warmup/time_conversion.md     | 53 +++++++++++++++++++
 3 files changed, 116 insertions(+)
 create mode 100644 algorithm-exercises-csharp-test/src/hackerrank/warmup/TimeConversion.Test.cs
 create mode 100644 algorithm-exercises-csharp/src/hackerrank/warmup/TimeConversion.cs
 create mode 100644 docs/hackerrank/warmup/time_conversion.md

diff --git a/algorithm-exercises-csharp-test/src/hackerrank/warmup/TimeConversion.Test.cs b/algorithm-exercises-csharp-test/src/hackerrank/warmup/TimeConversion.Test.cs
new file mode 100644
index 0000000..2af40b1
--- /dev/null
+++ b/algorithm-exercises-csharp-test/src/hackerrank/warmup/TimeConversion.Test.cs
@@ -0,0 +1,29 @@
+namespace algorithm_exercises_csharp.hackerrank;
+
+[TestClass]
+public class TimeConversionTest
+{
+  public class TimeConversionTestCase
+  {
+    public string input = "";
+    public string expected = "";
+  }
+
+  private static readonly TimeConversionTestCase[] tests = [
+    new() { input = "12:01:00PM", expected = "12:01:00" },
+    new() { input = "12:01:00AM", expected = "00:01:00" }
+  ];
+
+  [TestMethod]
+  public void testTimeConversion()
+  {
+    string? result;
+
+    foreach (TimeConversionTestCase test in tests)
+    {
+      result = TimeConversion.timeConversion(test.input);
+      Assert.AreEqual(test.expected, result);
+    }
+  }
+}
+
diff --git a/algorithm-exercises-csharp/src/hackerrank/warmup/TimeConversion.cs b/algorithm-exercises-csharp/src/hackerrank/warmup/TimeConversion.cs
new file mode 100644
index 0000000..14002d0
--- /dev/null
+++ b/algorithm-exercises-csharp/src/hackerrank/warmup/TimeConversion.cs
@@ -0,0 +1,34 @@
+// @link Problem definition [[docs/hackerrank/warmup/time_conversion.md]]
+
+namespace algorithm_exercises_csharp.hackerrank;
+
+using System.Diagnostics.CodeAnalysis;
+
+public class TimeConversion
+{
+  [ExcludeFromCodeCoverage]
+  protected TimeConversion() { }
+
+  public static string timeConversion(string _s)
+  {
+    string meridian = _s[^2..];
+    meridian = meridian.ToLower();
+
+    string time_str = _s[0..(_s.Length - 2)];
+    List<string> time = new(time_str.Split(":"));
+
+    int hour = Int32.Parse(time[0]);
+
+    if (hour >= 12)
+    {
+      hour = 0;
+    }
+    if (meridian == "pm")
+    {
+      hour += 12;
+    }
+
+    time[0] = String.Format("{0:00}", hour);
+    return String.Join(":", time);
+  }
+}
diff --git a/docs/hackerrank/warmup/time_conversion.md b/docs/hackerrank/warmup/time_conversion.md
new file mode 100644
index 0000000..273cd14
--- /dev/null
+++ b/docs/hackerrank/warmup/time_conversion.md
@@ -0,0 +1,53 @@
+# [Time Conversion](https://www.hackerrank.com/challenges/time-conversion)
+
+Difficulty: #easy
+Category: #warmup
+
+Given a time in
+12-[hour AM/PM format](https://en.wikipedia.org/wiki/12-hour_clock),
+convert it to military (24-hour) time.
+
+Note:
+
+- 12:00:00AM on a 12-hour clock is 00:00:00 on a 24-hour clock.
+- 12:00:00PM on a 12-hour clock is 12:00:00 on a 24-hour clock.
+
+## Example
+
+- s = '12:01:00PM' \
+  Return '12:01:00'
+- s = '12:01:00AM' \
+  Return '00:01:00'
+
+## Function Description
+
+Complete the timeConversion function in the editor below.
+It should return a new string representing the input time in 24 hour format
+timeConversion has the following parameter(s):
+
+- string s: a time in 12 hour format
+
+## Returns
+
+- string: the time in 24 hour format
+
+## Input Format
+
+A single string s that represents a time in 12-hour clock format
+(i.e.: hh_mm_ssAM or hh:mm:ssPM).
+
+## Constraints
+
+- All input times are valid
+
+## Sample Input 0
+
+```text
+07:05:45PM
+```
+
+## Sample Output 0
+
+```text
+19:05:45
+```