Fonds RBSC-ARC-1140 - Moses Cotsworth fonds

Title and statement of responsibility area

Title proper

Moses Cotsworth fonds

General material designation

Parallel title

Other title information

Title statements of responsibility

Title notes

Level of description


Reference code


Edition area

Edition statement

Edition statement of responsibility

Class of material specific details area

Statement of scale (cartographic)

Statement of projection (cartographic)

Statement of coordinates (cartographic)

Statement of scale (architectural)

Issuing jurisdiction and denomination (philatelic)

Dates of creation area


  • 1908-1931 (Creation)
    Cotsworth, Moses Bruine

Physical description area

Physical description

1.2 m of textual records and other materials.

Publisher's series area

Title proper of publisher's series

Parallel titles of publisher's series

Other title information of publisher's series

Statement of responsibility relating to publisher's series

Numbering within publisher's series

Note on publisher's series

Archival description area

Name of creator


Biographical history

Moses Bruine Cotsworth was born on December 3, 1859, in Willitoft, near York, England. He was the son of George and Sarah Cotsworth. Orphaned at the age of two, he was raised by his grandparents and great-grandparents. In 1884, he married Kezia H. Gardiner, (of Blairendinnie, Aberdeenshire), and they had one son and four daughters. He was educated at York Blue Coat School.
Cotsworth began work in 1874 in the office of the Chief Goods Manager of the North Eastern Railway Company, York. He had a series of jobs in which his aptitude for calculations and his investigative skill were evident: in 1881, he worked at Aire and Calder Navigation; from 1884 to 1886, he was the traffic manager for Trent Navigation; and from 1887 to 1891, he was the manager of Manners Colliery, Derbyshire. In 1892, he returned to the Chief Goods Manager office to work on a revision of railway rates and to do research. He published a book, Railway Maximum Rates and Charges, and his improved system of railway statistics has since been used by the British Railway companies and the Ministry of Transport. In 1907, he was appointed by the British Columbia government as Chairman of the Commission to re-organise and regrade the Civil Service. He moved to Vancouver in 1910, and from then until 1921, he was in business as an accountant and investigator of the cost of living for Western Canada.
Cotsworth devoted most of his time and efforts on calendar reform. His interest in calendars and time goes back to his upbringing by his grandparents and great-grandparents who used the old shadow pin, noon-mark, and hour-glass methods as well as an old series of calendars which contained charts, illustrations, and quotations. While he was working for the North Eastern Railway Company, he became aware of the difficulties in using the Gregorian calendar to calculate monthly totals for income and expenditures. These difficulties were due to the different number of weekdays in a month and the fact that, for the railway, every day of the week had a different economic value. The yearly changes of the date for Easter, and other holidays, imposed another difficulty. Even before he founded the International Fixed Calendar League in 1922, he was active in calendar reform. Cotsworth devised a thirteen-month calendar in which each month would have twenty-eight days or four weeks. The thirteenth month, called Sol, would be made up of the last thirteen days of June and the first fifteen days of July. In leap years, the extra day would be added after June the 28th. The 365th day, at the end of the year, would be called Year-day, and it would fall between December the 28th and January the 1st. In this way, Easter would always fall on the same date (the 15th of April). At one point, both the League of Nations and the Royal Society of Canada endorsed Cotsworth's proposal for calendar reform. The federal government of Canada officially endorsed it in 1931. However, Cotsworth's 13-month calendar was not adopted due to lack of world-wide consensus and to other individuals or calendar associations pushing for calendar reform.
Even though the International Fixed Calendar League ceased to exist, Cotsworth continued his work on calendar reform. From 1922 to 1931, he was the Director of the International Fixed Calendar League (previously called the International Almanak Reform League), as well as the Expert to the League of Nations' Committee on Calendar Reform. As such, he visited more than sixty countries as part of his effort to convince people of the benefits of converting to a 13-month calendar. He served as Secretary to the British Association's Research Committee on Geological Evidence of Climactic Change from 1934 to 1937. He was a Fellow of the Institute of Chartered Accountants, a Fellow of the Royal Statistical Society, and a Fellow of the Geological Society. His publications include monographs as well as a series of more than 50 pamphlets on calendar reform. He also wrote about railway rates and climactic change, among other topics. Moses Bruine Cotsworth died in Vancouver on June 4, 1943 .

Custodial history

The records were given to the University of British Columbia after Moses B. Cotsworth's death, as was instructed in his will. A fourth box of records was added in December, 1978 after it was discovered, uncatalogued, in the Main Stacks of the Main Library.

Scope and content

The fonds consists of textual records, photographs (prints and Negatives), pictorial images, postcards, statistical information, and maps. All of the records reflect Moses B. Cotsworth's involvement in calendar reform and his efforts to make his 13-month calendar more widely known throughout the world. Administrative records of his International Fixed Calendar League as well as papers reflecting his interests in mathematics, astronomy and astrology are included. The records have been arranged into the following series: Correspondence and Personal Notes; Newspaper Articles; Pamphlets on Calendar Reform and Related Material; Posters and Related Material; Records Relating to Egypt (Pyramids, Sphinx); Records Relating to Stonehenge; Statistical Charts and Graphs; and Records Relating to Miscellaneous Subjects.

Notes area

Physical condition

Immediate source of acquisition


The records were contained in four file storage boxes and one oversize Hollinger box. The materials seemed to be thrown together without any apparent order. Thus, there did not seem to be an original order given to the records by the creator. Apparently, from information obtained from one of his daughters, the fonds seems to be incomplete since many of Cotsworth's personal papers and belongings were lost at sea during World War II. Since all of the records deal with the principal activity of calendar reform, it was decided to arrange the series according to either the physical form of the records or the subject matter of the records.

Language of material

Script of material

Location of originals

Availability of other formats

Restrictions on access

Terms governing use, reproduction, and publication

Finding aids

Inventory available. PDF document attached.

Generated finding aid

Associated materials

Related materials


General note

The earliest date found on the textual records was 1867. However, there could be records in the fonds that pre-date 1867. The year of Cotsworth's death is taken as the terminal date because it is assumed that he continued working on the issue of calendar reform up until his death.

General note

Photograph Identifier: BC-1973

Physical description

1.2 m of textual records
416 photographs
203 charts
102 nitrate negatives
72 glass plate negatives
8 maps

Alternative identifier(s)

Standard number area

Standard number

Access points

Subject access points

Place access points

Name access points

Genre access points

Control area

Description record identifier

Rules or conventions


Level of detail

Dates of creation, revision and deletion

Finding aid created by Francesca Rossetti in March 2000 and converted from PDF to AtoM by Ashlynn Prasad in April 2020.

Language of description

Script of description


Information for the biographical sketch was obtained from a variety of sources:

  • Clay, Charles. "Calendar Reform." Encyclopedia Canadiana, 1970 ed.
  • Eastman, George . Do We Need Calendar Reform?, n.p., n.d.
  • Home Page for Calendar Reform, http://personal.ecu.edulmccartyr/cotsworth.html.
  • Who Was Who. Vol. 4, 1941-1950. London: Adam and Charles Black, 1952.

Accession area

Related subjects

Related people and organizations

Related places

Related genres