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+# [BUG] Quick add date defaults to tomorrow in evening
+
+## Description
+The date pre-filled in quick add defaults to tomorrow when used during the evening.
+
+## Symptom
+When adding a task in the evening, the date field pre-fills with tomorrow's date instead of today.
+
+## Technical Context
+- Likely a timezone or date boundary issue
+- Server may be using UTC while user expects local time
+- Or JavaScript date handling crossing midnight boundary incorrectly
+
+## Test Strategy
+
+### Unit Test (Red)
+**File:** `internal/handlers/handlers_test.go`
+
+```go
+func TestQuickAddDefaultDate(t *testing.T) {
+    tests := []struct {
+        name        string
+        serverTime  time.Time
+        userTZ      string
+        expectedDate string
+    }{
+        {
+            name:        "evening in US Eastern",
+            serverTime:  time.Date(2026, 1, 21, 23, 0, 0, 0, time.UTC), // 6pm ET
+            userTZ:      "America/New_York",
+            expectedDate: "2026-01-21", // Should be today, not tomorrow
+        },
+        {
+            name:        "late night edge case",
+            serverTime:  time.Date(2026, 1, 22, 4, 0, 0, 0, time.UTC), // 11pm ET
+            userTZ:      "America/New_York",
+            expectedDate: "2026-01-21",
+        },
+    }
+    // ...
+}
+```
+
+## Proposed Approach
+
+1. **Identify the source:**
+   - Check quick-add handler: how is default date determined?
+   - Check template: is date set server-side or client-side JS?
+   - Check if using `time.Now()` (server's timezone) vs user's timezone
+
+2. **Likely fix:**
+   - If server-side: pass user's timezone preference and convert
+   - If client-side: use `new Date()` which uses browser's local time
+   - Ensure consistent timezone handling throughout
+
+3. **Verify date calculation:**
+   - `today` should be based on user's local date, not UTC date
+   - Evening in US Eastern (UTC-5) at 8pm = UTC next day 1am
+
+## Debugging Steps
+1. Check current time on server vs browser
+2. Inspect what value is sent in quick-add form
+3. Check JavaScript date initialization if client-side
+4. Check Go `time.Now()` usage if server-side
+
+## Affected Components
+- `internal/handlers/handlers.go` (quick-add endpoint/template data)
+- `web/templates/partials/` (quick-add form)
+- `web/static/` (if JS sets date)
+- Potentially user preferences for timezone
+
+## Definition of Done
+- [ ] Quick add defaults to user's local today, regardless of time
+- [ ] Works correctly in evening hours
+- [ ] Works across timezone boundaries
+- [ ] Unit test covers evening edge case