Summary of Time Subsystem Functions Appendix B. ![]() and P.M.) Labels (Time Zones) Labels ( TDB, TT, and UTC ) Changing Default Behavior Abbreviated Years Range of Time String Components Default Time Systems, Time Zone, and Calendar Changing the Time System Time Zones Calendars Usage example Appendix A. SPICE Time Subsystem Abstract References Introduction Intended Audience Overview SPICE Time Representations Coordinated Universal Time (UTC) International Atomic Time (TAI) Naming the seconds of TAI - UTC Tying UTC to the Earth's Rotation Leapseconds The Leapseconds Kernel (LSK) Barycentric Dynamic Time (TDB) The J2000 Epoch Barycentric Dynamical Time (TDB) Terrestrial Time (TT) The Relationship between TT and TDB In the Toolkit ET Means TDB Naming the Seconds of TDB Leapseconds Computing UTC from TDB Problems With the Formulation of DeltaET Spacecraft Clock (SCLK) Julian Date The abbreviation JD Time Subsystem Functions Function to load needed kernels Function to convert a time string to TDB (ET) Function to convert UTC to TDB (ET) Function to convert a spacecraft clock time string to TDB (ET) Function to convert a TDB (ET) to a time string based on a format template Function to convert a TDB (ET) to UTC Function to convert a TDB (ET) to Spacecraft Clock time string Function to convert a TDB (ET) to Calendar format TDB Function to convert a TDB (ET) to Local True Solar Time Function to convert a TDB (ET) to planetocentric longitude of the sun Function to convert between uniform time scales Function to compute the difference between TDB (ET) and UTC Function to create a time string format picture Functions returning time constants Foundation Routines and Utilities Parse a time string to a time vector Convert between different parsed representations of time Time utility functions Input String Conversion Parsing Time Strings Labels (A.M.
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