diff --git a/config.nu b/config.nu
index 9140f7f..cda2a38 100644
--- a/config.nu
+++ b/config.nu
@@ -37,3 +37,45 @@ export def lumen-search-content [searchstr = string]: any -> table {
     }
   } | compact content -e
 }
+
+export def lumen-assono-worktime-calc [datestr = string]: nothing -> any {
+  let $datestr = $datestr | str replace ' +' ' '
+  mut $dateArray = []
+  let $rawDateArray = $datestr | split row ' '
+  if (($rawDateArray | length) mod 2 == 1) {
+    mut $spliceCounter = true
+    for $i in $rawDateArray {
+      if ($spliceCounter) {
+        $dateArray = $dateArray | append $i
+      }
+      $spliceCounter = not $spliceCounter
+    }
+  } else {
+    $dateArray = $rawDateArray
+  }
+
+  if (($dateArray | length) mod 2 == 1) {
+    error make {msg: 'Uneven Times given!'}
+  }
+
+  mut $dateArrayOutput = []
+  mut $dateArrayOutputBuilderCounter = true
+  for $i in $dateArray {
+    $dateArrayOutput = $dateArrayOutput | append ($i | date from-human | format date '%H:%M')
+    if ($dateArrayOutputBuilderCounter) {
+      $dateArrayOutput = $dateArrayOutput | append '-'
+    } else {
+      $dateArrayOutput = $dateArrayOutput | append '|'
+    }
+    $dateArrayOutputBuilderCounter = not $dateArrayOutputBuilderCounter
+  }
+  let $dateArrayOutput = ($dateArrayOutput | drop 1) | str join ' '
+
+  # $dateArray[0]
+  mut $hours = 0min
+  while (($dateArray | length) > 0) {
+    $hours += ($dateArray | get 1 | into datetime) - ($dateArray | get 0 | into datetime)
+    $dateArray = $dateArray | skip 2
+  }
+  $"($dateArrayOutput)\n($hours | into string)"
+}