1, the date is generally written in the upper right corner of the letter and expressed in the form of "month/day/year", for example, 6/2 1/2023. This format can clearly indicate the date, or it can be easily sorted by diagonal lines.
2. In formal business letters, the format of "day/month/year" is usually used, such as 2 1/6/2023. This format is also one of the more common date formats, but compared with "month/day/year", its application scope is slightly narrower.
3. In informal letters, you can also use the format of "year-month-day", for example, 2023-6-2 1. Although this format is not common, it can also be used to represent dates.