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Liam M. Healy authored
When conversion to UT1 was attempted but *real-ut1-utc* was NIL, the result was a timepoint that had the original dtspec value but whose scale was set to :ut1. This has been fixed by returning two values from convert-utc-ut1, the second value being a success indicator, which is used by convert-time-scale to to determine how to set the scale on the timepoint.