init

internal/challenge/timeutil.go

@@ -0,0 +1,58 @@
+package challenge
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const day = 24 * time.Hour
+
+func parseClock(value string) (time.Duration, error) {
+	parts := strings.Split(value, ":")
+	if len(parts) != 3 {
+		return 0, fmt.Errorf("bad time %q", value)
+	}
+	h, err := strconv.Atoi(parts[0])
+	if err != nil {
+		return 0, err
+	}
+	m, err := strconv.Atoi(parts[1])
+	if err != nil {
+		return 0, err
+	}
+	s, err := strconv.Atoi(parts[2])
+	if err != nil {
+		return 0, err
+	}
+	if h < 0 || h > 23 || m < 0 || m > 59 || s < 0 || s > 59 {
+		return 0, fmt.Errorf("bad time %q", value)
+	}
+	return time.Duration(h)*time.Hour + time.Duration(m)*time.Minute + time.Duration(s)*time.Second, nil
+}
+
+func formatClock(d time.Duration) string {
+	d %= day
+	if d < 0 {
+		d += day
+	}
+	h := int(d / time.Hour)
+	d -= time.Duration(h) * time.Hour
+	m := int(d / time.Minute)
+	d -= time.Duration(m) * time.Minute
+	s := int(d / time.Second)
+	return fmt.Sprintf("%02d:%02d:%02d", h, m, s)
+}
+
+func formatDuration(d time.Duration) string {
+	if d < 0 {
+		d = 0
+	}
+	h := int(d / time.Hour)
+	d -= time.Duration(h) * time.Hour
+	m := int(d / time.Minute)
+	d -= time.Duration(m) * time.Minute
+	s := int(d / time.Second)
+	return fmt.Sprintf("%02d:%02d:%02d", h, m, s)
+}