What's new in CalcTime! ✨ Undo & Redo: Step back/forward through calculations (↩/↪). ± Quick sign inversion (+/-). 🔁 Constant calculation: Repeat last operation by tapping '=' consecutively. ⌫ Backspace button (digit by digit). ⚙️ Settings menu: Toggle key vibration feedback. 🧠 Enhanced Memory Banks & History with date/time. 🚀 Android 15 compatibility.