bin labels and totals correct for year, review

ts/lib/tslib/time.ts

@@ -170,20 +170,37 @@ export function dayLabel(daysStart: number, daysEnd: number): string {
         } else {
             return tr.statisticsDaysAgoSingle({ days: -daysStart });
         }
-    } else {
-        // range
-        if (daysStart >= 0) {
-            return tr.statisticsInDaysRange({
-                daysStart,
-                daysEnd: daysEnd - 1,
-            });
         } else {
-            return tr.statisticsDaysAgoRange({
+            // range
-                daysStart: Math.abs(daysEnd - 1),
+            if (daysStart >= 0) {
-                daysEnd: -daysStart,
+                return tr.statisticsInDaysRange({
-            });
+                    daysStart,
+                    daysEnd: daysEnd - 1,
+                });
+            } else {
+                // For bins that cross or end at day 0, we need special handling
+                if (daysEnd > 0) {
+                    // Bin crosses day 0: show from 0 to the oldest day (exclusive of endDay)
+                    // If bin is [-5, 1), we want "0-4 days ago"
+                    return tr.statisticsDaysAgoRange({
+                        daysStart: 0,
+                        daysEnd: -daysStart - 1,
+                    });
+                } else {
+                    // Bin is entirely in the past: show from newest to oldest
+                    // For a bin [startDay, endDay), to show consecutive ranges like "0-4", "5-9", "10-14",
+                    // we use endDay as the start of the range
+                    // The bin width is daysEnd - daysStart, so daysEnd = daysStart + (width - 1)
+                    // Example: bin [-10, -5) has width 5, should show "5-9 days ago"
+                    const binWidth = Math.abs(daysEnd - daysStart);
+                    const daysStartAbs = Math.abs(daysEnd);
+                    return tr.statisticsDaysAgoRange({
+                        daysStart: daysStartAbs,
+                        daysEnd: daysStartAbs + binWidth - 1,
+                    });
+                }
+            }
         }
-    }
 }
 
 /** Helper for converting Unix timestamps to date strings. */

ts/routes/graphs/reviews.ts

@@ -237,7 +237,9 @@ export function renderReviews(
 
     function tooltipText(d: BinType, cumulative: number): string {
         const startDay = Math.floor(d.x0!);
-        const endDay = Math.ceil(d.x1!);
+        // If bin ends at 0, treat it as including day 0 (so use 1 as endDay for dayLabel)
+        // For negative bins, use the bin end directly (dayLabel will handle the conversion)
+        const endDay = d.x1! === 0 ? 1 : d.x1! < 0 ? d.x1! : Math.ceil(d.x1!);
         const day = dayLabel(startDay, endDay);
         const totals = totalsForBin(d);
         const dayTotal = valueLabel(sum(totals));