yahoo fix

src/atcb-links.js

@@ -309,9 +309,22 @@ function atcb_generate_yahoo(data, date, subEvent = 'all') {
   urlParts.push('https://calendar.yahoo.com/?v=60');
   // generate and add date
   const formattedDate = atcb_generate_time(date, 'clean');
-  urlParts.push('st=' + encodeURIComponent(formattedDate.start) + '&et=' + encodeURIComponent(formattedDate.end));
   if (formattedDate.allday) {
-    urlParts.push('dur=allday');
+    if (formattedDate.start === formattedDate.end) {
+      urlParts.push('dur=allday&st=' + encodeURIComponent(formattedDate.start)); // for all-day events, we may only set the start date
+    } else {
+      // however, if it spans multiple days, we need to set a time instead of all-day
+      // therefore, we copy the data object, add startTime "00:00" and endTime "23:59" and generate the time again with timeZone being set to the user's timeZone
+      // TODO: Remove this workaround, when Yahoo allows all-day events spanning multiple days
+      const allDayDate = JSON.parse(JSON.stringify(date));
+      allDayDate.startTime = '00:00';
+      allDayDate.endTime = '23:59';
+      allDayDate.timeZone = Intl.DateTimeFormat().resolvedOptions().timeZone;
+      const formattedAllDayDate = atcb_generate_time(allDayDate, 'clean');
+      urlParts.push('st=' + encodeURIComponent(formattedAllDayDate.start) + '&et=' + encodeURIComponent(formattedAllDayDate.end));
+    }
+  } else {
+    urlParts.push('st=' + encodeURIComponent(formattedDate.start) + '&et=' + encodeURIComponent(formattedDate.end));
   }
   // add details (if set)
   if (date.name && date.name !== '') {