A computer-implemented method for translating time between calendar systems is described herein. The method includes accessing a first tree structure for a first calendar system, where data corresponding to the first tree structure include time intervals for the first calendar system that are arranged into layers of nodes, and where the layers of nodes are mapped to universal time. The method also includes scheduling a calendar content item corresponding to a time fragment relative to the universal time. The method further includes translating the calendar content item to a first human-readable time fragment for the first calendar system by traversing the first tree structure corresponding to the first calendar system to convert the time fragment to the first human-readable time fragment based on the mapping of the layers of nodes of the first tree structure to the universal time.