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All space missions must maintain a precise knowledge of time, as measured onboard the spacecraft. This is done by correlating measurements of time from the spacecraft's onboard clock with standard Earth time scales, as defined on the ground. Time correlation is essential for the correct timing of command executions, identification of received telemetry, use of ephemerides, instrument data processing, and many other related activities. In the past, space missions have typically developed their own custom software and procedures for performing time correlation. The Multi-Mission Time Correlation (MMTC) system is a software application and associated procedure that provides a reusable, customizable, and consistent means of performing time correlation for a variety of space missions. It leverages years of time correlation experience obtained from multiple past and current missions. The MMTC is a standalone and highly customizable application that is designed to perform time correlation for a variety of disparate missions. It is intended to reduce the cost of space mission ground systems by providing a mission agnostic solution. The MMTC is included in NASA's AMMOS catalog of reusable mission software components.