ECSS Packet Utilisation — Absolute-Time Data Type (space-systems/ecss/e7041-absolute-time)

Convert an on-board moment to and from the absolute-time parameter a packet definition declares, under ECSS-E-ST-70-41C clause 7.3.10. Use when a generation time, a time-tagged release or a collection-interval start reads plausibly wrong on the ground: fixing the time code, the coarse and fine field widths and the epoch in the definition rather than on the wire, truncating downwards so an encoded time never names a later moment, and refusing a time past the coarse span instead of wrapping it into the wrong era. Trigger: ecss, e-st-70-41c, pus-absolute-time-parameter, cuc-coarse-fine-time-code, cds-day-segmented-time-code, on-board-time-epoch-agreement, absolute-time-span-…