First, we need to learn the word “week”. In Chinese, it is 星期（xīng qī ). The next is easy.
For Monday, it is week(day) one — 星期一（xīng qī yī )
For Tuesday, it is week(day) two — 星期二（xīng qī èr )
For Wednesday, it is week(day) three –星期三（xīng qī sān )
For Thursday, it is week(day) four –星期四（xīng qī sì )
For Friday, it is week(day) five –星期五（xīng qī wǔ )
For Saturday, it is week(day) six –星期六（xīng qī liù )
For Sunday, oh, hang on, it is NOT week(day) seven , it is either week(day) SUN or week(day) SKY — 星期日（xīng qī rì ) 星期天（xīng qī tiān ) 。
How to write 星期?There is a short video I created to help you write.
[kml_flashembed movie="http://sketchcast.com/swf/player.swf?id=dS1jh7z" width="435" height="350" wmode="transparent" /]
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