diff --git a/kernel/av/av.go b/kernel/av/av.go
index d31461f80..7a9e4eb36 100644
--- a/kernel/av/av.go
+++ b/kernel/av/av.go
@@ -177,15 +177,27 @@ type ValueDate struct {
 type DateFormat string
 
 const (
-	DateFormatNone DateFormat = ""
+	DateFormatNone     DateFormat = ""
+	DateFormatDuration DateFormat = "duration"
 )
 
-func NewFormattedValueDate(content int64, format DateFormat) (ret *ValueDate) {
+func NewFormattedValueDate(content, content2 int64, format DateFormat) (ret *ValueDate) {
+	formatted := time.UnixMilli(content).Format("2006-01-02 15:04")
+	if 0 < content2 {
+		formatted += " → " + time.UnixMilli(content2).Format("2006-01-02 15:04")
+	}
+	switch format {
+	case DateFormatNone:
+	case DateFormatDuration:
+		t1 := time.UnixMilli(content)
+		t2 := time.UnixMilli(content2)
+		formatted = util.HumanizeRelTime(t1, t2, util.Lang)
+	}
 	ret = &ValueDate{
 		Content:          content,
-		Content2:         0,
+		Content2:         content2,
 		HasEndDate:       false,
-		FormattedContent: time.UnixMilli(content).Format("2006-01-02 15:04:05"),
+		FormattedContent: formatted,
 	}
 	return
 }
diff --git a/kernel/av/table.go b/kernel/av/table.go
index 2d43a32e1..a59d11b82 100644
--- a/kernel/av/table.go
+++ b/kernel/av/table.go
@@ -574,7 +574,7 @@ func (table *Table) calcColDate(col *TableColumn, colIndex int) {
 			}
 		}
 		if 0 != earliest {
-			col.Calc.Result = &Value{Date: NewFormattedValueDate(earliest, DateFormatNone)}
+			col.Calc.Result = &Value{Date: NewFormattedValueDate(earliest, 0, DateFormatNone)}
 		}
 	case CalcOperatorLatest:
 		latest := int64(0)
@@ -586,7 +586,7 @@ func (table *Table) calcColDate(col *TableColumn, colIndex int) {
 			}
 		}
 		if 0 != latest {
-			col.Calc.Result = &Value{Date: NewFormattedValueDate(latest, DateFormatNone)}
+			col.Calc.Result = &Value{Date: NewFormattedValueDate(latest, 0, DateFormatNone)}
 		}
 	case CalcOperatorRange:
 		earliest := int64(0)
@@ -602,7 +602,7 @@ func (table *Table) calcColDate(col *TableColumn, colIndex int) {
 			}
 		}
 		if 0 != earliest && 0 != latest {
-			col.Calc.Result = &Value{Date: NewFormattedValueDate(latest-earliest, DateFormatNone)}
+			col.Calc.Result = &Value{Date: NewFormattedValueDate(earliest, latest, DateFormatDuration)}
 		}
 	}
 }