PerfectCalendar is a Open Source Windows program in the Other category, developed by Gsasl. The current version is 1.3.0; you can download it safely from its official source with the download button above.
PerfectCalendar is a pure C / Win32 API taskbar calendar that boots silently to the system tray and weighs ~230 KB on disk — no .NET, no WebView2, no background sync daemon.
Key features: • Flat-file event scheduling (events.dat — plain text, always yours) • MCM_SETDAYSTATE bitmask highlighting — days with events appear bold • Wildcard recurring events: ****-12-25 (yearly), ****-**-01 (monthly) • Global hotkey (Ctrl+Shift+Space default) — summons to your cursor • Conflict-safe hotkey: shows tray notification instead of crashing • Idle fade transparency via WS_EX_LAYERED • ISO week-number column (MCS_WEEKNUMBERS) • Multi-format date copy (ISO 8601, US, long form) • UTC clock alongside local time • HiDPI / 4K aware, mouse-wheel font zoom • Explorer crash resilience (TaskbarCreated) • All settings persisted to HKCU registry
✨ Features
calendartaskbartrayclockeventsschedulerwin32lightweightdark-mode
📝 Release notes (1.3.0)
v1.3.0 — Full feature release [future updates required suggestions welcome]
NEW
• Add-Event: inline subclassed EDIT control (Enter = save, Esc = cancel)
• Recurring events: ****-MM-DD (yearly) and ****-**-DD (monthly)
• Hotkey submenu in tray: 3 presets + Disabled, all check-marked
• MOD_NOREPEAT on RegisterHotKey prevents key-repeat flooding
• Tray balloon on hotkey conflict — app keeps running normally
• MCN_GETDAYSTATE bitmask bold-day highlighting (MCS_DAYSTATE)
• ISO week-number column (MCS_WEEKNUMBERS)
• Multi-format copy: ISO / US / long form via NM_RCLICK
• UTC clock label (GetSystemTime)
• Smooth idle transparency fade (WS_EX_LAYERED, TID_FADE timer)
• Owner-drawn LISTBOX: recurring events in accent blue
• F5 hot-reload events without restart
FIXED
• Silent tray boot: ShowWindow removed from WinMain — no more
aggressive popup on every system startup when Run on Startup enabled
• SetWindowSubclass replaces legacy SetWindowLongPtr subclassing
• hFontSmall / hSelBrush / hListBrush fully cleaned in WM_DESTROY
• All timers explicitly KillTimer'd in WM_DESTROY
• Mutex name versioned to avoid collision with older installs
SHA-256: d93b8356fa3a01a2ea7cfc90436db13e5cb3a62831dd7dd69e4fed59c840b363
