Calendar dates

In this lesson, we will learn:

• How to write calendar dates in written form (words, ordinals, and numbers)
• How to write calendar dates in metric notation (numbers only, in the format: yyyy/mm/dd)
• Writing calendar dates using numbers in a variety of formats (mm/dd/yyyy OR mm/dd/yy OR dd/mm/yy)

Notes:

• Calendars and dates keep track of time! A date is a reference to a specific day in time, and we can tell how much time passes between two dates.
• Calendar dates use the units of time for: month, day, and year

• The written form of a calendar date is in the format: [month] [day]^ordinal, [year]
• Ex. December 25^th, 2020

• The metric notation of a calendar date is in the order: year / month / date
• i.e. yyyy / mm / dd (sometimes it is seen with dashes or spaces instead)
• this orders the time units from longest to shortest durations
• Ex. 2020 / 12 / 25 is December 25^th, 2020

• *A special exception is that February has 29 days (instead of 28 days) during a leap year (every 4 years).

• Dates in metric notation are used often when filling in paperwork!
• There are other formats of writing out the date using numbers:
• mm/dd/yyyy (different order)
• mm/dd/yy (only the last 2 digits of the year)
• dd/mm/yy (different order)