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A time interval is the distance or difference
between two timepoints on a timescale. If repeated regularly, intervals
can be measured in metric units, which are in the context of synkronize:
seconds, minutes, hours, days, weeks, months, years.
The 'granularity' of a timescale, i.e. another word for "unit". Units are seconds, minutes, hours, days, weeks, months, years.
An interval scale is a metric scale that
allows to measure quantity and difference of values in metric units.
In regard to time and date, in the context of synkronize,
these values are timepoints on a timescale in units like seconds or days.
The term 'onset' is borrowed from music theory where it is used to mark the beginning of a note, but doesn't denote pitch or length. Likewise the onset in regard to timepoint generation for scheduling marks the starting of some action, without specifying the action itself or its duration.
Two timepoints marking beginning and end of a time range, which can be a closed or half-open interval.