Reliable Task Timer is a timer/logger utility that allows precise calculation of time spent on a specific task. The application logs the following information to a CSV spreadsheet: task start date and time, task end date and time, task name, task description, task length in hours, minutes, and seconds. CSV files can be further modified with Microsoft Excel or similar software. The application permits users to select output directory and to assign custom names to output CSV files. In addition to this, the application automatically persists most recently used output directory path and most recently used custom CSV file name. Reliable Task Timer is an ideal tool for professionals who bill their assignments on hourly basis.