diff --git a/res/values/strings.xml b/res/values/strings.xml
index 2670a78ed..c32359dd8 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -179,6 +179,7 @@
     <string name="download_error_malformed_url">Malformed URL</string>
     <string name="download_error_io_error">IO Error</string>
     <string name="download_error_device_not_found">External storage unavailable</string>
+    <string name="time_dialog_invalid_input">Invalid input, time has to be an integer</string>
     
 
 </resources>
\ No newline at end of file
diff --git a/src/de/danoeh/antennapod/dialog/TimeDialog.java b/src/de/danoeh/antennapod/dialog/TimeDialog.java
index de4ccabd1..fb5a72931 100644
--- a/src/de/danoeh/antennapod/dialog/TimeDialog.java
+++ b/src/de/danoeh/antennapod/dialog/TimeDialog.java
@@ -2,32 +2,41 @@ package de.danoeh.antennapod.dialog;
 
 import java.util.concurrent.TimeUnit;
 
-import de.danoeh.antennapod.R;
 import android.app.Dialog;
 import android.content.Context;
-import android.content.DialogInterface;
 import android.os.Bundle;
+import android.text.Editable;
+import android.text.TextWatcher;
+import android.util.Log;
 import android.view.View;
 import android.view.Window;
 import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.Spinner;
+import android.widget.Toast;
+import de.danoeh.antennapod.AppConfig;
+import de.danoeh.antennapod.R;
 
 public abstract class TimeDialog extends Dialog {
+	private static final String TAG = "TimeDialog";
 
 	private static final int DEFAULT_SPINNER_POSITION = 1;
-	
+
+	private Context context;
+
 	private EditText etxtTime;
 	private Spinner spTimeUnit;
 	private Button butConfirm;
 	private Button butCancel;
 
 	private String[] spinnerContent = { "s", "min", "h" };
-	private TimeUnit[] units = { TimeUnit.SECONDS, TimeUnit.MINUTES, TimeUnit.HOURS };
+	private TimeUnit[] units = { TimeUnit.SECONDS, TimeUnit.MINUTES,
+			TimeUnit.HOURS };
 
 	public TimeDialog(Context context, int titleTextId, int leftButtonTextId) {
 		super(context);
+		this.context = context;
 	}
 
 	@Override
@@ -39,13 +48,15 @@ public abstract class TimeDialog extends Dialog {
 		spTimeUnit = (Spinner) findViewById(R.id.spTimeUnit);
 		butConfirm = (Button) findViewById(R.id.butConfirm);
 		butCancel = (Button) findViewById(R.id.butCancel);
-		
+
 		butConfirm.setText(R.string.set_sleeptimer_label);
 		butCancel.setText(R.string.cancel_label);
 		setTitle(R.string.set_sleeptimer_label);
-		ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this.getContext(), android.R.layout.simple_spinner_item,
+		ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(
+				this.getContext(), android.R.layout.simple_spinner_item,
 				spinnerContent);
-		spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+		spinnerAdapter
+				.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
 		spTimeUnit.setAdapter(spinnerAdapter);
 		spTimeUnit.setSelection(DEFAULT_SPINNER_POSITION);
 		butCancel.setOnClickListener(new View.OnClickListener() {
@@ -59,11 +70,52 @@ public abstract class TimeDialog extends Dialog {
 
 			@Override
 			public void onClick(View v) {
-				dismiss();
-				onTimeEntered(readTimeMillis());
+				try {
+					long input = readTimeMillis();
+					onTimeEntered(input);
+					dismiss();
+				} catch (NumberFormatException e) {
+					e.printStackTrace();
+					Toast toast = Toast.makeText(context,
+							R.string.time_dialog_invalid_input,
+							Toast.LENGTH_LONG);
+					toast.show();
+				}
 			}
 		});
+		etxtTime.addTextChangedListener(new TextWatcher() {
 
+			@Override
+			public void afterTextChanged(Editable s) {
+				checkInputLength(s.length());
+			}
+
+			@Override
+			public void beforeTextChanged(CharSequence s, int start, int count,
+					int after) {
+
+			}
+
+			@Override
+			public void onTextChanged(CharSequence s, int start, int before,
+					int count) {
+
+			}
+		});
+		checkInputLength(etxtTime.getText().length());
+
+	}
+
+	private void checkInputLength(int length) {
+		if (length > 0) {
+			if (AppConfig.DEBUG)
+				Log.d(TAG, "Length is larger than 0, enabling confirm button");
+			butConfirm.setEnabled(true);
+		} else {
+			if (AppConfig.DEBUG)
+				Log.d(TAG, "Length is smaller than 0, disabling confirm button");
+			butConfirm.setEnabled(false);
+		}
 	}
 
 	public abstract void onTimeEntered(long millis);