Date and time

Date adopted: 
December 11, 2019
Last update: 
August 15, 2020

Date

Use a dash (not a hyphen) for overlapping, two-year spans.

Not: 2016/17
But: 2016–17

Also use a dash for multiple-year spans.

Not: 2016/19
But: 2016–19

Write months in full wherever you can and write "to" rather than using a dash between dates.

Monday, August 14, 2017
December 4 to 6
December 2011

When dates – including the month, day and year – appear in a sentence, put a comma after the year.

January 1, 2017, was the first day the agreement came into effect.

Time

Not: 10:00 a.m., 10:00 a.m. – 11:00 a.m.
But: 10 a.m., 10:15 a.m., 10 a.m. to 11 a.m.