If you are interested in astronomical time scales, the next version of Lady
Heather can display time in most of those (plus a few others like Besselian and
HJD). It also supports importing the current delta-T value from an external
file (that something like a chron task can keep updated from your favorite
source) or you can set it manually from the keyboard/command line.
> but also TAI, UT, UT0, UT1, UT2, ET, TDT, TDB,
> TT, TCG, TCB, GPS, etc...
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