Abstract: The present invention describes mobile phone applications that include methods and systems which automatically schedule tasks from a dynamically-changing task list for efficient utilization of available time. Unlike the prior personal task scheduling systems, the proposed system uses optimization algorithms and computer programs when creating a time schedule of tasks. In order to schedule individual tasks, the system takes into account multiple constraints controllable by the user. Basic constraints include individual task's deadline, start-time, minimum and maximum time-chunks for task fragments, relative priority of tasks (in case of time-collision), etc. Further constraints may include user's general preferences regarding individual task or group of tasks. Specifically, preferences may include time-of-day (e.g., morning, evening), location (e.g., home, work, particular grocery store or chain, particular gym, park), etc.