words for "week"

hi changye

yes you're right ,的确，现代中国历法的“星期”包含着“七曜”的因素，anyway 我认为一周七天的计日法的源头应该是 西方宗教 上的，而在将这种外来文化引进的时候结合了本土文化。

这也可以说是a match point of deferent cultures~异曲同工之妙

Thank you all. This is very helpful.

they have the same meaning and usage,atually they can replace each other

Hi heroius

It's possible that the word "星期" (star cycle?) was invented based on the concept "七曜" (qi1yao4) used in ancient China. The traditional "seven day system" based on 七曜 is used in modern Korea and Japan, but not in China.

七曜/star/planets ...Japanese(Korean)...English

日---太阳(sun)---------日曜日(일요일).....Sunday
月---月亮(moon)-------月曜日(월요일).....Monday
火---火星(Mars)--------火曜日(화요일).....Tuesday
水---水星(Mercury)-----水曜日(수요일)....Wednesday
木---木星(Jupiter)------木曜日(목요일)....Thurseday
金---金星(Venus)------金曜日(금요일).....Friday
土---土星(Saturn)------土曜日(토요일)....Saturday

如果追溯这几个词的字面意义，

礼拜：chapel，明显的与宗教传播有关，礼拜天 就是the day we have chapel

星期：planetary cycle，根据英文单词的字义翻译而来，由于sunday~saturday每天都象征了一颗行星

周：week，一种日期的集合，seven days

礼拜、星期、周

都可以的

礼拜一、星期一、周一

礼拜日、星期日、周日=礼拜天、星期天（没有“周天”）

hi,all

in china,礼拜 is the anthor way expression.

for example, 礼拜一=monday=星期一

and i think the “礼拜一 ”be  used  in oral chinese.

Don't forget, 礼拜 :)