Referring to the Gregorian Calendar?

Today I glanced at this Littler newsletter, which discusses a case involving a dispute over forum selection. But what caught my eye wasn’t the dispute itself. It was the language at issue:

This Agreement is subject to the provisions of the Labor Law No. (58) for the year 1970 Gregorian and its amendments and the law on Social Solidarity No. (13) for the year 1980 Gregorian and its amendments and all other decision, decree or regulation which have not been specifically mentioned in this Agreement.

Perhaps I lead a sheltered life, but I don’t recall having seen in a contract a reference to the Gregorian calendar, which is the calendar system initially adopted in 1582 by Catholic countries in Europe and now used almost everywhere in the world for civil purposes.

So of course I went on EDGAR, where I found references to the Gregorian calendar in 22 documents filed in the past year.

The following example is from an asset purchase agreement between a Japanese buyer and sellers from Delaware and Switzerland:

Unless the context otherwise requires, references herein to … a month, quarter and year are references to a month, quarter and year of the Gregorian Calendar ….

The following is from a joint venture contract between parties from Japan and China:

The Company shall use Gregorian calendar for its financial year, which shall commence from 1st January and end on 31st December of each year.

And the following is from a Colombian oil-and-gas contract:

Year: It refers to the term of twelve (12) consecutive months according to the Gregorian Calendar, counted as of a specific date.

And the following is from an oil-and-gas operation agreement between a Delaware company and an English company:

Calendar Year means a period of twelve (12) months commencing with January 1 and ending on the following December 31 according to the Gregorian Calendar.

What other calendars are there besides the Gregorian calendar? Go here for a list on Wikipedia. But in my search of contracts filed in the past year on EDGAR, I found no references to any calendar system other than the Gregorian calendar.

So, readers: When, if at all, is it advisable to refer to the Gregorian calendar? Have you encountered references to any other kind of calendar?

About the author

Ken Adams is the leading authority on how to say clearly whatever you want to say in a contract. He’s author of A Manual of Style for Contract Drafting, and he offers online and in-person training around the world. He’s also chief content officer of LegalSifter, Inc., a company that combines artificial intelligence and expertise to assist with review of contracts.