Is there a reason for the days of the week being written and pronounced without the 日?


I sometimes see the days of the week written without 日. Are there specific
reasons on when 日would not be used?




That's a informal way of saying.

For example:

> 月曜にまた会おう

This sentence gives listeners a friendly-impression. So you can't say 月曜, 火曜,
水曜, … to your boss.




That's a informal way of saying.

For example:

> 月曜にまた会おう

This sentence gives listeners a friendly-impression. So you can't say 月曜, 火曜,
水曜, … to your boss.

