Marc,

Does this change fix the problem?
<https://gitlab.com/dpk/presrfis/-/commit/e771cca6ae70843ceb3b63b5bcbdd9b34098ff00>

(Changed ‘they both had the same idea of when midnight was’ to ‘they both had the same idea of when midnight +on that date+ was’; changed ‘Every 86,400 SI seconds exactly since’ to ‘Every 86,400 TAI seconds exactly since’.)

Daphne