diff --git a/time/timeutil/constants.go b/time/timeutil/constants.go
index c3f9b0ef..1524fb97 100644
--- a/time/timeutil/constants.go
+++ b/time/timeutil/constants.go
@@ -3,15 +3,19 @@ package timeutil
 import "time"
 
 const (
-	Day  = 24 * time.Hour
-	Week = 7 * Day
+	Day         = 24 * time.Hour
+	Week        = 7 * Day
+	WorkDay     = 8 * time.Hour
+	WorkWeek    = 5 * WorkDay
+	WorkDay996  = 12 * time.Hour
+	WorkWeek996 = 6 * WorkDay996
 
-	DaysPerWeek = float32(7)
 	HoursPerDay = float32(24)
+	DaysPerWeek = float32(7)
 
-	SecondsPerDay  = 24 * 60 * 60
-	SecondsPerWeek = 7 * SecondsPerDay
-	SecondsPerYear = (365 * SecondsPerDay) + (6 * 60 * 60)
+	DaySeconds  = 24 * 60 * 60
+	WeekSeconds = 7 * DaySeconds
+	YearSeconds = (365 * DaySeconds) + (6 * 60 * 60)
 
 	MonthsEN = `["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]`
 )
diff --git a/time/timeutil/duration.go b/time/timeutil/duration.go
index 18458512..250f42b5 100644
--- a/time/timeutil/duration.go
+++ b/time/timeutil/duration.go
@@ -45,11 +45,11 @@ func ParseDuration(s string) (time.Duration, error) {
 			return zeroDuration, err
 		}
 		if units == "d" {
-			s = fmt.Sprintf("%vs", i*SecondsPerDay)
+			s = fmt.Sprintf("%vs", i*DaySeconds)
 		} else if units == "w" {
-			s = fmt.Sprintf("%vs", i*SecondsPerWeek)
+			s = fmt.Sprintf("%vs", i*WeekSeconds)
 		} else if units == "y" {
-			s = fmt.Sprintf("%vs", i*SecondsPerYear)
+			s = fmt.Sprintf("%vs", i*YearSeconds)
 		} else {
 			return zeroDuration, errors.New("timeutil.ParseDuration Parse Error")
 		}