The content of the invitation clearly States the reason, time and date. Date of signing the invitation letter.

For example:

In order to thank relatives and friends for their care over the years, we hosted a banquet at xx Hotel on the morning of Saturday, 23rd of this month 1 1 to share our friendship. Please come then.

Xxxxxx 2016 65438+1October 20th

(Because the date of signature is specific, there is no need to write a specific year and month in the post, otherwise it will be concise. The date is Gregorian calendar. )