depends on how you box up contextual relative time line facts. 24 hours a day, 7 days a week 52 weeks a year regardless February 29, 12 months between either winter solstice annually humanity created the new year based on the fact 88% of human population live north of the equator and 82% live between International dateline and Greenwich Prime Meridian.
About when a day physically begins at dawn or sunrise because there is a conflict of interest every latitude intersection with longitude every rotation of the planet. Seems sunrise is a constant event where dawn is also a constant event in the direction revolving around a star while rotating with an orbiting moon.
Series parallel movements like evolving one at a time.