diff --git a/api/repo/data.go b/api/repo/data.go
index a61ee5a..8809594 100644
--- a/api/repo/data.go
+++ b/api/repo/data.go
@@ -3,7 +3,6 @@ package repo
 import (
 	"errors"
 	"fmt"
-
 	"time"
 
 	"git.icod.de/dalu/refdata/model"
@@ -200,6 +199,30 @@ func (r *DataRepository) List(p *DataParams) ([]*model.Data, error) {
 		q["enabled"] = p.EnabledQuery.Query
 	}
 
+	// time
+	if p.When {
+		switch p.WhenQuery.Operation {
+		case "eq":
+			q["when"] = p.WhenQuery.From
+		case "gt":
+			q["when"] = bson.M{"$gt": p.WhenQuery.From}
+		case "gte":
+			q["when"] = bson.M{"$gte": p.WhenQuery.From}
+		case "lt":
+			q["when"] = bson.M{"$lt": p.WhenQuery.To}
+		case "lte":
+			q["when"] = bson.M{"$lte": p.WhenQuery.To}
+		case "gt-lt":
+			q["when"] = bson.M{"$gt": p.WhenQuery.From, "$lt": p.WhenQuery.To}
+		case "gte-lte":
+			q["when"] = bson.M{"$gte": p.WhenQuery.From, "$lte": p.WhenQuery.To}
+		case "gte-lt":
+			q["when"] = bson.M{"$gte": p.WhenQuery.From, "$lt": p.WhenQuery.To}
+		case "gt-lte":
+			q["when"] = bson.M{"$gt": p.WhenQuery.From, "$lte": p.WhenQuery.To}
+		}
+	}
+
 	var m []*model.Data
 	rq := c.Find(q)