PnL Behavior Calendar is a desktop plugin for cTrader that transforms trade history into a monthly calendar view focused on trading behavior analysis. It displays daily net profit and loss alongside trade counts, enabling users to review winning and losing days at a glance. Selecting a specific day reveals detailed completed positions and highlights behavioral patterns such as losing streaks, overtrading, and rapid re-entry following losses. The plugin also provides time-of-day summaries adjusted to the user's time zone to identify periods prone to poor trading decisions. Designed as a read-only review tool, it does not execute or modify trades and does not provide trading signals or advice. Its primary function is to help traders understand which behaviors impact their performance by visualizing trade activity and behavioral flags within an intuitive calendar interface.