1 files changed, 10 insertions, 2 deletions
diff --git a/tex/context/base/mkiv/l-os.lua b/tex/context/base/mkiv/l-os.lua
index 9aa8b8aa7..1e0135094 100644
--- a/tex/context/base/mkiv/l-os.lua
+++ b/tex/context/base/mkiv/l-os.lua
@@ -604,11 +604,19 @@ os.isleapyear = isleapyear
 
 local days = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
 
-local function nofdays(year,month)
+local function nofdays(year,month,day)
     if not month then
         return isleapyear(year) and 365 or 364
-    else
+    elseif not day then
         return month == 2 and isleapyear(year) and 29 or days[month]
+    else
+        for i=1,month-1 do
+            day = day + days[i]
+        end
+        if month > 2 and isleapyear(year) then
+            day = day + 1
+        end
+        return day
     end
 end