[Hacker Rank]: Time Conversion solved ✓

Author: Gonzalo Diaz

docs/hackerrank/warmup/timeConversion.md

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+# [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
+```

src/pkg/hackerrank/warmup/timeConversion.go

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+/**
+ * @link Problem definition [[docs/hackerrank/warmup/timeConversion.md]]
+ */
+
+package hackerrank
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	utils "gon.cl/algorithm-exercises/src/utils"
+)
+
+func TimeConversion(s string) string {
+	meridian := s[len(s)-2:]
+	meridian = strings.ToLower(meridian)
+
+	timeStr := s[0 : len(s)-2]
+	time := strings.Split(timeStr, ":")
+	hour, _ := strconv.Atoi(time[0])
+
+	if hour >= 12 {
+		hour = 0
+	}
+
+	if meridian == "pm" {
+		hour += 12
+	}
+
+	time[0] = fmt.Sprintf("%02d", hour)
+
+	conversion := strings.Join(time, ":")
+
+	utils.Info("TimeConversion answer => %s", conversion)
+
+	return conversion
+}

src/pkg/hackerrank/warmup/timeConversion_test.go

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+package hackerrank
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestTimeConversionExample(t *testing.T) {
+	var tests = []struct {
+		input string
+		want  string
+	}{
+		{input: "12:01:00PM", want: "12:01:00"},
+		{input: "12:01:00AM", want: "00:01:00"},
+	}
+
+	for _, tt := range tests {
+
+		testname := fmt.Sprintf("TimeConversion(%s) => %s", tt.input, tt.want)
+		t.Run(testname, func(t *testing.T) {
+			ans := TimeConversion(tt.input)
+			assert.Equal(t, tt.want, ans)
+		})
+	}
+}
+
+func TestTimeConversionTestCases(t *testing.T) {
+	var tests = []struct {
+		title string
+		input string
+		want  string
+	}{
+		{title: "Case 0", input: "07:05:45PM", want: "19:05:45"},
+	}
+
+	for _, tt := range tests {
+
+		testname := fmt.Sprintf("TimeConversion(%s) %s => %s", tt.input, tt.title, tt.want)
+		t.Run(testname, func(t *testing.T) {
+			ans := TimeConversion(tt.input)
+			assert.Equal(t, tt.want, ans)
+		})
+	}
+}