The invention relates to a time-keeping transmission system (90) comprising: a first moving part (10) comprising a first toothing (10a); a second moving part (11) comprising a second toothing (11a), meshing with the first moving part and designed to be driven by the first moving part; and a third moving part (14) comprising a third toothing (14a) designed to mesh with the second moving part and designed to be driven by the second moving part; the meshing of the first toothing with the second toothing being irreversible and the meshing of the third toothing with the second toothing being irreversible.
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