Calendrical

At that point, humanity crosses another threshold, miniaturizes its universe into symbolic form, and takes a toddling step toward iconography, writing, and the first stammerings of calendrical notation and mathematics.

Source: wiktionary

Although other ancient Mesoamerican societies, even in the Preclassic period, also possessed calendars, only the Maya calendar can be translated directly into today's calendrical system.

Source: wiktionary

This growing focus on calendrical matters in early modern Europe paralleled, and in some measure directly influenced, a renewed interest among Jews in their own calendar.

Source: wiktionary

In Vietnam, the calendrical system of "heavenly stems and earthly branches" sounds quite mystical and foreign, but this lunar calendar can in fact be translated quite simply into a Western calendar year with a formula and a chart.

Source: wiktionary