Dates and days between events

A calendar is a structured number grid for time. To find how many days separate two events, locate both dates, decide which direction time moves, then count the jumps between dates.

Reliable routine: Find start → Find finish → Count jumps → Cross weeks/months carefully → Check.

• A day is Monday, Tuesday and so on.
• A date identifies a particular day in a month, such as 18 March.
• One week later is usually 7 days later and appears in the same weekday column.

Moving one box forward means one day has passed. Moving to the same weekday in the next row means 7 days have passed.

Important: From the 3rd to the 4th is 1 day, not 2. Count the movement between dates, not both labels.

1. Same week

From Tuesday 4 to Friday 7: 4→5 is 1 day, 5→6 is 2 days, 6→7 is 3 days. 3 days pass.

2. Two weeks later

If an event is on Monday 3, one week later is Monday 10 and two weeks later is Monday 17. Use the weekday columns as a check.

3. Across a month boundary

If a month ends on the 30th, the next day is the 1st of the next month. Do not restart the count; continue one day at a time.

4. Days left in a month

If today is the 27th and the month has 30 days, count 27→28, 28→29, 29→30: there are 3 days until the 30th.

AC9M2M03: identify the date and determine the number of days between events using calendars.

• E1: locate dates and determine dates 2 weeks before or after
• E2: create and use a class calendar for meaningful events
• E3: use addition and calendar structure to determine days remaining in a month/year
• E4: locate significant school, community and cultural dates

• Counting both the start and finish date. For elapsed days, count the jumps after the start date.
• Confusing weekday with date. “Tuesday” is a day; “Tuesday 14 May” is a date.
• Thinking every month has the same number of days. Check the actual calendar.
• Restarting at zero when the month changes. Time continues across the boundary.

1. Calendar detective: find today's date, yesterday's date and tomorrow's date.
2. Week jumps: mark a date, then locate 1 week before, 1 week after and 2 weeks after.
3. Event countdown: mark a class event and count the jumps from today.
4. Cross-month challenge: count from the final few days of one month into the next.
5. Class calendar: record birthdays, excursions and assemblies and compare which events are closer together.

• Find the start and finish dates first.
• Count calendar jumps, not printed date numbers.
• Same weekday next week = 7 days later.
• 2 weeks = 14 days.
• Check month lengths when crossing months.

Quick check

1. What date is 7 days after 6 June?
2. How many days pass from Monday to Thursday?
3. What is the difference between a day and a date?
4. Why can a month boundary cause errors?