diff --git a/bundles/org.openhab.binding.astro/src/main/java/org/openhab/binding/astro/internal/handler/AstroThingHandler.java b/bundles/org.openhab.binding.astro/src/main/java/org/openhab/binding/astro/internal/handler/AstroThingHandler.java
index dfb34d61ccbae..c369eb99cde29 100644
--- a/bundles/org.openhab.binding.astro/src/main/java/org/openhab/binding/astro/internal/handler/AstroThingHandler.java
+++ b/bundles/org.openhab.binding.astro/src/main/java/org/openhab/binding/astro/internal/handler/AstroThingHandler.java
@@ -310,7 +310,7 @@ public void schedule(Job job, Calendar eventAt) {
             monitor.unlock();
         }
         if (logger.isDebugEnabled()) {
-            String formattedDate = this.isoFormatter.format(eventAt);
+            final String formattedDate = this.isoFormatter.format(eventAt.getTime());
             logger.debug("Scheduled {} in {}ms (at {})", job, sleepTime, formattedDate);
         }
     }