hugo/docs/content/en/methods/time/Truncate.md

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Truncate	Returns the result of rounding TIME down to a multiple of DURATION since January 1, 0001, 00:00:00 UTC.			related returnType signatures functions/time/AsTime functions/time/ParseDuration methods/time/Round time.Time TIME.Truncate DURATION

The Truncate method operates on TIME as an absolute duration since the zero time; it does not operate on the presentation form of the time. If DURATION is a multiple of one hour, Truncate may return a time with a non-zero minute, depending on the time zone.

{{ $t := time.AsTime "2023-01-27T23:44:58-08:00" }}
{{ $d := time.ParseDuration "1h"}}

{{ ($t.Truncate $d).Format "2006-01-02T15:04:05-00:00" }} → 2023-01-27T23:00:00-00:00