diff --git a/README-de.md b/README-de.md
index f0bda65..1df7503 100644
--- a/README-de.md
+++ b/README-de.md
@@ -438,6 +438,25 @@ Beispiele:
   #end for
   </table>
   ```
+* Sonnenaufgang, Sonnenuntergang und Tageslichtlänge unter
+  Verwendung der  `timestamp`-Option
+  ```
+  <table>
+  <tr>
+    <th>sunrise</th>
+    <th>sunset</th>
+    <th>daylight</th>
+  </tr>
+  #for $dd in $week.days
+  <tr>
+    <td>$dd.format("%A")</td>
+    <td>$daylight(timestamp=$dd).start</td>
+    <td>$daylight(timestamp=$dd).end</td>
+    <td>$daylight(timestamp=$dd).length</td>
+  </tr>
+  #end for
+  </table>
+  ```
 
 
 ## Algorithmus:
diff --git a/README.md b/README.md
index 22efe6f..22426b5 100644
--- a/README.md
+++ b/README.md
@@ -428,6 +428,24 @@ Examples:
   #end for
   </table>
   ```
+* sunrise, sunset, and duration of daylight using the `timestamp` option
+  ```
+  <table>
+  <tr>
+    <th>sunrise</th>
+    <th>sunset</th>
+    <th>daylight</th>
+  </tr>
+  #for $dd in $week.days
+  <tr>
+    <td>$dd.format("%A")</td>
+    <td>$daylight(timestamp=$dd).start</td>
+    <td>$daylight(timestamp=$dd).end</td>
+    <td>$daylight(timestamp=$dd).length</td>
+  </tr>
+  #end for
+  </table>
+  ```
 
 ## Algorithm:
 
diff --git a/bin/user/GTS.py b/bin/user/GTS.py
index 64273bc..230ad99 100644
--- a/bin/user/GTS.py
+++ b/bin/user/GTS.py
@@ -101,7 +101,7 @@
         
 """
 
-VERSION = "0.8a5"
+VERSION = "0.8b1"
 
 # deal with differences between python 2 and python 3
 try:
diff --git a/bin/user/dayboundarystats.py b/bin/user/dayboundarystats.py
index e6c3a4a..a7dce73 100644
--- a/bin/user/dayboundarystats.py
+++ b/bin/user/dayboundarystats.py
@@ -47,7 +47,7 @@
 
 """
 
-VERSION = "0.8a5"
+VERSION = "0.8b1"
 
 # deal with differences between python 2 and python 3
 try:
diff --git a/changelog b/changelog
index 7a83edd..f791027 100644
--- a/changelog
+++ b/changelog
@@ -58,3 +58,6 @@
 0.8a5 04nov2022
 * rename option "day" to "timestamp"
 * get correct temperature and barometer for calculating sunrise and sunset in $daylight
+* property "length"
+0.8b1 06nov2022
+* docu
diff --git a/install.py b/install.py
index eced759..54fb252 100644
--- a/install.py
+++ b/install.py
@@ -10,7 +10,7 @@ def loader():
 class GTSInstaller(ExtensionInstaller):
     def __init__(self):
         super(GTSInstaller, self).__init__(
-            version="0.8a5",
+            version="0.8b1",
             name='GTS',
             description='Provides Gruenlandtemperatursumme (GTS), a kind of growing degree days',
             author="Johanna Roedenbeck",