South America: Brazil (210), Colombia ... scientific, computing, industrial, or governmental contexts. See Date and time notation in the United States.)
Date and time notation in Canada combines conventions from the United Kingdom, conventions from the United States, and conventions from France, often creating confusion. The Government of Canada specifies the ISO 8601 format for all-numeric dates ( YYYY - MM - DD ; for example, 2022-12-03). 
American styles of notation have also influenced customs of date notation in Canada, creating confusion in international commerce.  In traditional American usage, dates are written in the month–day–year order (e.g. December 2, 2022) with a comma before and after the year if it is not at the end of a sentence,  and time in 12-hour notation (2:02 pm).
Encountering a p.m. time written in the 12-hour notation (e.g. 6:30 meaning 18:30) is likely to cause confusion with people used to the 24-hour written notation. In certain languages such as Spanish , Portuguese , Dutch , and English the hour is divided into quarters and halves, spoken of relative to the closest hour.
A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 November 2022" is ten days after "15 November 2022". The date of a particular event depends on the observed time zone.
It unified and replaced a number of older ISO standards on various aspects of date and time notation: ISO 2014, ISO 2015, ISO 2711, ISO 3307, and ISO 4031. It has been superseded by a second edition ISO 8601:2000 in 2000, by a third edition ISO 8601:2004 published on 1 December 2004, and withdrawn and revised by ISO 8601-1:2019 and ISO 8601-2:2019 on 25 February 2019.
The empty string is a syntactically valid representation of zero in positional notation (in any base), which does not contain leading zeros. Since the empty string does not have a standard visual representation outside of formal language theory, the number zero is traditionally represented by a single decimal digit 0 instead.