Well, no. In the first place they had two calendars - a religious calendar and a civil calendar and the days weren't exact matches.

The design is based on engineering -- what will enable a pyramid structure to rise as high as possible and not collapse into the sand. The Red Pyramid is one of three or four built by Sneferu, and they all have different proportions.

Something with a calendrical function would have an observatory for the helical rising of Sirius and markers for the hours of the night... and wouldn't be in/associated with a huge building that has almost no room inside and is essentially not functional for anything. There's no sense in encoding a cycle of days in a large building when you can associate it with a temple complex supported by the wealth of the king's estates -- a temple with libraries and good spaces for observing the sky. Where you could write the numbers in stone.

There are a number of temples that have feast dates inscribed on them, and where observations would have been made. Using a pyramid in the middle of the desert to say "hey! The year has 360 days" makes no sense.

-- Byrd
Moderator, Hall of Ma'at