Calendar Year Definition:

The full twelve month period beginning on January 1 and ending on December 31.

Many jurisdictions, out of an abundance of caution, have defined the term calendar months. For example, the Canadian Interpretation Act at 37(1)(a):

"Calendar year means a period of twelve consecutive months commencing on January 1."

The New Brunswick Interpretation Act:

"Calendar year means the period from the first day of January to the last day of December then following, inclusive."

REFERENCES:

• Duhaime, Lloyd, Legal Definition of Calendar Day
• Duhaime, Lloyd, Legal Definition of Calendar Month
• Duhaime, Lloyd, Legal Definition of Calendar Quarter
• Duhaime, Lloyd, Legal Definition of Calendar Week
• Interpretation Act, R.S.C. 1985, c. I-27, §37(1)(a)
• Interpretation Act, R.S.B.C. 1996, c. 238, §29
• Interpretation Act, R.S.N.B. 1973, c. I-13, §38
• Interpretation Act, R.S.P.E.I. 1988, c. I-8, §26
• Lechter v M.N.R., [1964] CTC 510 and at 64 DTC 5311 (1965)
• Reeves & Co. v. Ozias, 1 W.W.R. 517 (1911, S.C.C.)
• Ternoey v. Goulding, (1982), 132 D.L.R. (3d) 44 (ONCA)