Mon. is the short written form of Monday. You will see it on calendars, school timetables, shop signs, and at the top of letters or emails, where there is little space: Mon. 12 May.

Mon. is the short written form of MondayMon.是Monday的書面縮寫。You will see it on calendars, school timetables, shop signs你會在日曆、學校課表、商店招牌上看到它，and at the top of letters or emails, where there is little space以及信件或email開頭空間不夠的地方：Mon. 12 MayMon. 12 May。

People almost only use it in writing. When we speak, we say Monday, not Mon.

People almost only use it in writing人們幾乎只在書面上用它。When we speak說話的時候，we say Monday, not Mon.我們會說Monday，不會說Mon.。

In British English there is often a full stop (Mon.); American writers often leave the stop off. It is not a different word from Monday, and it is not short for month.

In British English there is often a full stop在英式英語裡通常會加句點 (Mon.)（Mon.）；American writers often leave the stop off美式作者常常不加。It is not a different word from Monday它不是跟Monday不同的一個字，and it is not short for month也不是month的縮寫。

Though actually, which day counts as the first day of the week is not the same everywhere: many diaries in English start the row with Monday, but some (especially American ones) still start with Sunday, so Mon. may sit in a different column depending on the page.

Though actually不過其實，which day counts as the first day of the week is not the same everywhere哪一天算是一週的第一天，各地並不一樣：many diaries in English start the row with Monday很多英文的行事曆一行是從Monday開始，but some (especially American ones) still start with Sunday但有些（尤其是美國的）還是從Sunday開始，so Mon. may sit in a different column depending on the page所以Mon.在不同頁面上可能會落在不同的欄位。