add cron to loop

server/ajax/form/cron.go

@@ -8,10 +8,10 @@ import (
 
 type Cron string
 
-func (c Cron) Next() time.Time {
+func (c Cron) Next(since time.Time) time.Time {
 	schedule, err := cron.ParseStandard(string(c))
 	if err != nil {
 		return time.Time{}
 	}
-	return schedule.Next(time.Now())
+	return schedule.Next(since)
 }