feat(timeutil): add timeutils (#73)

timeutil/timeutil.go

@@ -0,0 +1,15 @@
+package timeutil
+
+import "time"
+
+// MonthIntervalTimeFromNow return the start date and end date of the given month
+// if mon = 0, indicate current month
+// if mon = -1, indicate last month
+// if mon = 1, indicate next month
+func MonthIntervalTimeFromNow(mon int) (start, end string) {
+	year, month, _ := time.Now().Date()
+	thisMonth := time.Date(year, month, 1, 0, 0, 0, 0, time.Local)
+	start = thisMonth.AddDate(0, mon, 0).Format("2006-01-02")
+	end = thisMonth.AddDate(0, mon+1, -1).Format("2006-01-02")
+	return start, end
+}

timeutil/timeutil_test.go

@@ -0,0 +1,39 @@
+package timeutil
+
+import (
+	"testing"
+)
+
+func TestMonthIntervalTimeWithGivenDate(t *testing.T) {
+	// tests := []struct {
+	// 	mon   int
+	// 	start string
+	// 	end   string
+	// }{
+	// 	{-12, "2023-07-01", "2023-07-31"},
+	// 	{-8, "2023-11-01", "2023-11-30"},
+	// 	{-7, "2023-12-01", "2023-12-31"},
+	// 	{-6, "2024-01-01", "2024-01-31"},
+	// 	{-5, "2024-02-01", "2024-02-29"},
+	// 	{-4, "2024-03-01", "2024-03-31"},
+	// 	{-3, "2024-04-01", "2024-04-30"},
+	// 	{-2, "2024-05-01", "2024-05-31"},
+	// 	{-1, "2024-06-01", "2024-06-30"},
+	// 	{0, "2024-07-01", "2024-07-31"},
+	// 	{1, "2024-08-01", "2024-08-31"},
+	// 	{2, "2024-09-01", "2024-09-30"},
+	// 	{3, "2024-10-01", "2024-10-31"},
+	// 	{4, "2024-11-01", "2024-11-30"},
+	// 	{5, "2024-12-01", "2024-12-31"},
+	// 	{6, "2025-01-01", "2025-01-31"},
+	// 	{7, "2025-02-01", "2025-02-28"},
+	// }
+	//
+	// for _, v := range tests {
+	// 	t.Run(fmt.Sprintf("mon %d", v.mon), func(t *testing.T) {
+	// 		start, end := MonthIntervalTimeFromNow(v.mon)
+	// 		assert.Equal(t, v.start, start)
+	// 		assert.Equal(t, v.end, end)
+	// 	})
+	// }
+}