What is different about the Spanish days of the week versus the English?

In Spanish, the days of the week are written in masculine form. The days of the week on the Spanish calendar will start on Monday known as "lunes" and end on Sunday known as "domingo". Whereas in the English format on an English calendar the days of the week start on Sunday and end on Saturday. Also in the Spanish calendar, the days of the week are NEVER capitalized but in the English calendar, they ARE capitalized.

Here are the days of the week in the Spanish format just in case you needed them!

I hope that helps you along your Spanish journey!! :)