Comment by carlosjobim

There's people who count days instead of months and dates, so called "ordinal dates". Military and flight are some examples.

There's people who count weeks instead of months and dates. "We're visiting my parents when we have our vacations in week 28". Incredibly annoying.

I think our modern calendar is a result of when sun cults and moon cults mixed in the Mediterranean. The farther North you go, the more important are the yearly seasons (sun). They determine everything and are deeply embedded within the soul of people. Spring - summer - autumn - winter. Those are the important phases.

Then the farther South you go, the less important are the yearly seasons and the better way to track time is the moon. Especially as women's fertility is tied to the moon phases. So months become the standard of measure and are then conveniently divided into four weeks (28 can only be divided by two or four).