Talking about your schedule is important. The days of the week are simple in Chinese. They follow the pattern "Week + Number":

• 星期一 (xīngqīyī): Monday

• 星期二 (xīngqī'èr): Tuesday

• 星期三 (xīngqīsān): Wednesday

• 星期四 (xīngqīsì): Thursday

• 星期五 (xīngqīwǔ): Friday

• 星期六 (xīngqīliù): Saturday

• 星期日 / 星期天 (xīngqīrì / xīngqītiān): Sunday