diff --git a/main.go b/main.go
index 8cd8df6..ba210b2 100644
--- a/main.go
+++ b/main.go
@@ -51,9 +51,9 @@ func main() {
 		os.Exit(1)
 	}
 
-	commits := processRepos(repos, email, b.Since, b.Until)
+	commits := processRepos(repos, email, *b)
 	fmt.Print("\n\n")
-	printTable(commits, b.Since, b.Until)
+	printTable(commits, *b)
 	fmt.Print("\n\n")
 }
 
diff --git a/print.go b/print.go
index ca41607..cf22edd 100644
--- a/print.go
+++ b/print.go
@@ -30,24 +30,24 @@ func getDay(i int) string {
 	return strings.Repeat(" ", 3)
 }
 
-func printTable(commits map[int]int, since, until time.Time) {
-	for since.Weekday() != time.Sunday {
-		since = since.AddDate(0, 0, -1)
+func printTable(commits map[int]int, b Boundary) {
+	for b.Since.Weekday() != time.Sunday {
+		b.Since = b.Since.AddDate(0, 0, -1)
 	}
-	for until.Weekday() != time.Saturday {
-		until = until.AddDate(0, 0, 1)
+	for b.Until.Weekday() != time.Saturday {
+		b.Until = b.Until.AddDate(0, 0, 1)
 	}
 
-	fmt.Printf("%s     %s\n", sixEmptySpaces, buildHeader(since, until))
+	fmt.Printf("%s     %s\n", sixEmptySpaces, buildHeader(b.Since, b.Until))
 	max := getMaxValue(commits)
 
 	s := strings.Builder{}
-	s1 := since
+	s1 := b.Since
 
 	for i := 0; i < 7; i++ {
 		s.WriteString(fmt.Sprintf("%-5s", getDay(i)))
 		sn2 := s1
-		for !sn2.After(until) {
+		for !sn2.After(b.Until) {
 			d := daysAgo(sn2)
 			s.WriteString(printCell(commits[d], max))
 			sn2 = sn2.AddDate(0, 0, 7)
diff --git a/print_test.go b/print_test.go
index 78dd243..5b139b9 100644
--- a/print_test.go
+++ b/print_test.go
@@ -153,14 +153,16 @@ func TestPrintTable(t *testing.T) {
 		13: 0,
 	}
 
-	since := time.Date(2024, 2, 7, 0, 0, 0, 0, time.UTC)
-	until := time.Date(2024, 2, 19, 0, 0, 0, 0, time.UTC)
+	b := Boundary{
+		Since: time.Date(2024, 2, 7, 0, 0, 0, 0, time.UTC),
+		Until: time.Date(2024, 2, 19, 0, 0, 0, 0, time.UTC),
+	}
 
 	oldStdout := os.Stdout
 	r, w, _ := os.Pipe()
 	os.Stdout = w
 
-	printTable(commits, since, until)
+	printTable(commits, b)
 	w.Close()
 
 	dat, err := io.ReadAll(r)
@@ -173,23 +175,23 @@ func TestPrintTable(t *testing.T) {
 	var buf strings.Builder
 	_, _ = fmt.Fprint(&buf, string(dat))
 
-	for since.Weekday() != time.Sunday {
-		since = since.AddDate(0, 0, -1)
+	for b.Since.Weekday() != time.Sunday {
+		b.Since = b.Since.AddDate(0, 0, -1)
 	}
-	for until.Weekday() != time.Saturday {
-		until = until.AddDate(0, 0, 1)
+	for b.Until.Weekday() != time.Saturday {
+		b.Until = b.Until.AddDate(0, 0, 1)
 	}
 
 	s := strings.Builder{}
-	s1 := since
+	s1 := b.Since
 
-	s.WriteString(fmt.Sprintf("%s     %s\n", sixEmptySpaces, buildHeader(since, until)))
+	s.WriteString(fmt.Sprintf("%s     %s\n", sixEmptySpaces, buildHeader(b.Since, b.Until)))
 
 	max := getMaxValue(commits)
 	for i := 0; i < 7; i++ {
 		s.WriteString(fmt.Sprintf("%-5s", getDay(i)))
 		sn2 := s1
-		for !sn2.After(until) {
+		for !sn2.After(b.Until) {
 			d := daysAgo(sn2)
 			s.WriteString(printCell(commits[d], max))
 			sn2 = sn2.AddDate(0, 0, 7)
diff --git a/stats.go b/stats.go
index 58aed50..5450d4f 100644
--- a/stats.go
+++ b/stats.go
@@ -12,13 +12,13 @@ const sixMonthsInDays int = 182
 
 var now = time.Now()
 
-func fillCommits(path, email string, commits map[int]int, since, until time.Time) error {
+func fillCommits(path, email string, commits map[int]int, b Boundary) error {
 	repo, err := git.PlainOpen(path)
 	if err != nil {
 		return err
 	}
 
-	commitIterator, err := repo.Log(&git.LogOptions{Since: &since, Until: &until})
+	commitIterator, err := repo.Log(&git.LogOptions{Since: &b.Since, Until: &b.Until})
 	if err != nil {
 		return err
 	}
@@ -38,11 +38,11 @@ func fillCommits(path, email string, commits map[int]int, since, until time.Time
 	return err
 }
 
-func processRepos(repos []string, email string, since, until time.Time) map[int]int {
+func processRepos(repos []string, email string, b Boundary) map[int]int {
 	m := map[int]int{}
 	var err error
 	for _, repo := range repos {
-		err = fillCommits(repo, email, m, since, until)
+		err = fillCommits(repo, email, m, b)
 		if err != nil {
 			fmt.Printf("failed to fill commits in %q: %v", repo, err)
 		}
diff --git a/stats_test.go b/stats_test.go
index db70c50..c5f936c 100644
--- a/stats_test.go
+++ b/stats_test.go
@@ -42,13 +42,15 @@ func TestFillCommits(t *testing.T) {
 		},
 	}
 
-	since := time.Now().AddDate(0, 0, -1)
-	until := time.Now().AddDate(0, 0, 1)
+	b := Boundary{
+		Since: time.Now().AddDate(0, 0, -1),
+		Until: time.Now().AddDate(0, 0, 1),
+	}
 
 	for _, tt := range tests {
 		t.Run(tt.Name, func(t *testing.T) {
 			commits := map[int]int{}
-			err = fillCommits(tt.Path, tt.Email, commits, since, until)
+			err = fillCommits(tt.Path, tt.Email, commits, b)
 			if err != nil {
 				t.Fatalf("failed to fill commits in %q: %v", tt.Path, err)
 			}
@@ -97,12 +99,14 @@ func TestProcessRepos(t *testing.T) {
 		},
 	}
 
-	since := time.Now().AddDate(0, 0, -1)
-	until := time.Now().AddDate(0, 0, 1)
+	b := Boundary{
+		Since: time.Now().AddDate(0, 0, -1),
+		Until: time.Now().AddDate(0, 0, 1),
+	}
 
 	for _, tt := range tests {
 		t.Run(tt.Name, func(t *testing.T) {
-			commits := processRepos(tt.Repos, tt.Email, since, until)
+			commits := processRepos(tt.Repos, tt.Email, b)
 			if len(commits) != len(tt.Expected) {
 				t.Errorf("processRepos11() = %v, want %v", commits, tt.Expected)
 			}