Numbers & Dates
Generally, write out numbers one through nine and use numerical figures for numbers 10 and up.
Always use numerical figures
- For decimals
- In tables of data
- When referencing parts of a whole
- Phase 1, Section 1, Grade 1, page 1, line 9
- For money
- 1,200 CAD
Don't use decimals unless a $ symbol is used
When the number is four digits or longer, separate with commas rather than spaces or periods.
Always write out the numbers at the beginning of a sentence:
- Ten people attended the meeting.
For large numbers, use a combination of numerical figures and words:
- 12 million
Always keep numbers and related words together on one line.
- 236-123-4567 ext. 123
Write out the word percent in sentences and paragraphs, but use the % symbol in financial charts, tables, equations and calculations.
Don't use an apostrophe for plural numbers, including decades.
- The 1980s were exciting
- Give me all the 10s and 20s
Write out ordinal numbers, except in charts or tables. Don't use superscript.
- First, second, third
- 1st (not 1st)
Write out fractions that stand alone without a preceding whole number, unless the written form is long or the fraction is part of a technical measurement or calculation.
- One-half of the people were registered
- 5/32 inch
Use the metric system for all measurements. Always use Canadian spelling and abbreviations for metric terms.
- Metre is m
- Kilometre is km
- Kilogram is kg
- Metric tonne is t
- Hour is h
- Celsius is C (the word Celsius and its symbol C are always capitalized)
If you're writing about a historical example, use the measurement system of the time.
- The speed limit on the Lions Gate Bridge when it opened in 1938 was 15 miles per hour
If the number is spelled out, also spell out the metric term.
- He walked three kilometres to the store
Use a space between the number and the symbol, except when writing temperatures.
- 10 km (not 10km)
- The weather was a sunny 23°C on Wednesday
Use a hyphen and spell out the metric term only when the metric quantity is an adjective.
- A 10-kilogram sack
Avoid putting dates on information unless it’s important or the content expires.
Write out the full name of the month wherever possible. Use the first three letters of the month to abbreviate, except for March, April, May, June and July, which are never abbreviated.
Use these formats:
- Wednesday, March 25, 2015
- March 25, 2015
- March 25
Write out days of week wherever possible. Abbreviate to the first three letters, with no punctuation.
- Monday or Mon
- Thu, Jan 1, 2015
Use "to" instead of dashes in date ranges
Digital format for dates uses the international standard YYYY-MM-DD separated by hyphens.
For screen reading devices, it's best to separate date from time with a comma.
- September 25, 2015, 1:30 pm
Use numerical figures when writing about decades.
- The 1920s, the 1980s, the ‘80s, the mid-1960s
When writing about centuries, spell out the numbers one to nine and use digits for 10 and above.
- The fifth century
- The 19th century
Hours with no minute time are written numerically with no zeros.
- 9 am (not 9:00 am)
Hours with the minute time have a colon.
- 9:45 pm
Write out noon and midnight. Don't write 12 noon or 12 midnight.
Don't use periods with or capitalize am and pm. Include a space after the number.
- 9 am or 9 pm
Use "to" instead of dashes in time ranges
A colon is used to separate hours, minutes and seconds, unless spelled out.
- His official race time was 2:15:45
- He took two hours 15 minutes and 45 seconds to cross the finish line
Capitalize Pacific, Atlantic and Newfoundland when the time zone is spelled out, but not mountain, central and eastern.
- Pacific daylight time, mountain standard time
Time zones are abbreviated and capitalized when included as part of a clock time.
- 10 am PST
When writing out a date and time, write the date first followed by a comma to separate the time. This ensures screen reading devices can read the date and time correctly.
- Monday, July 1, 2015, 3:30 pm