I am thinking of a "naive" timekeeping system of the sort I believe would be likely to be implemented by non-specialists.

• A day is exactly 24 hours. An hour is exactly 60 minutes. A minute is exactly 60 seconds. No exceptions (i.e. no Daylight Saving or leap seconds).
• A leap year occurs exactly once every four years: if the year modulo 4 equals 0, it is a leap year. The month lengths are the normal 31 days for January, 28 or 29 days for February, etc., that you would expect to find on a wall calendar.
• Days of the week, if they are used, are what you would get by taking your contemporary (late 1900's / early 2000's) wall calendar and, using the above rules for leap years and month lengths, extrapolating in both directions: if the calendar goes far back enough, February 29, 1900 exists and is a Wednesday; and if the calendar goes far forward enough, February 29, 2100 exists and is a Monday.

What name, if any, is used to describe precisely this system?