Monday Start vs Sunday Start Calendar: Same Dates, Different First Column

A Monday-start and a Sunday-start calendar list the same dates; only the first column changes. ISO 8601 weeks begin on Monday, according to Markus Kuhn’s summary of the standard hosted by NASA, while Microsoft Support says Outlook’s first day of the week is Sunday by default. Below is one real month, November 2026, drawn both ways, the steps to switch the first day in three calendar apps, and a printable decision checklist you can download with this story.

November 2026 in both layouts

November 2026 has 30 days and starts on a Sunday (we computed the weekdays with two independent methods). That makes it a good test month, because the layout changes how many rows you need.

Sunday first: five rows

Sun	Mon	Tue	Wed	Thu	Fri	Sat
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30

Monday first: six rows

Mon	Tue	Wed	Thu	Fri	Sat	Sun
						1
2	3	4	5	6	7	8
9	10	11	12	13	14	15
16	17	18	19	20	21	22
23	24	25	26	27	28	29
30

Nov. 1 sits alone in the last column of the first row in the Monday-first grid. Every other date stays on the same weekday in both tables; only its column moves. If you want to print this month either way, the November printable calendars page has the monthly sheets, and our Monday-start printable covers the Monday-first version.

How the two layouts compare

Feature	Monday first	Sunday first
First column	Monday	Sunday
Weekend position	Saturday and Sunday are the last two columns, side by side	Sunday is the first column and Saturday the last, one at each edge
Match with ISO weeks	Each row is one ISO week, Monday to Sunday	A row holds one Sunday from the previous ISO week and six days of the next
Rows needed for November 2026	6	5
Outlook default	Choose it in settings	Default, per Microsoft Support

The ISO row is our computation from the Monday-to-Sunday week rule. In November 2026, the Sunday-first row that reads 1 to 7 puts Sunday, Nov. 1 (the last day of ISO week 44) next to Monday, Nov. 2 through Saturday, Nov. 7 (ISO week 45). The Monday-first grid keeps weeks 45 to 48 in whole rows.

Do week numbers change with the first day?

They can, and this is where the two layouts stop being only a matter of taste. ISO week numbers follow a fixed rule: Kuhn’s summary says a week starts on Monday and that week 01 is the first week with a Thursday in the new year. Google Docs states the same rule for its ISOWEEKNUM function: weeks begin on Monday, and week 1 is the week containing the first Thursday.

Microsoft’s WEEKNUM function lets you choose. Return type 1 or omitted starts the week on Sunday under System 1, where the week containing Jan. 1 is week 1. Return type 2 starts on Monday under System 1. Return type 21 starts on Monday under System 2, the ISO 8601 method. Microsoft also offers ISOWEEKNUM(date) as a direct ISO answer.

Here are the ISO week numbers for Mondays in November 2026, computed from the Thursday rule and checked with a second method:

Monday	ISO week
Nov. 2, 2026	45
Nov. 9, 2026	46
Nov. 16, 2026	47
Nov. 23, 2026	48
Nov. 30, 2026	49

A Sunday-first grid with a simple week count down the side would label the row of Nov. 1 to 7 with one number, even though two ISO weeks meet in it. If you plan with ISO week numbers, a Monday-first grid is the layout where the label matches the row. Our explainer on ISO week numbers covers the Thursday rule and the 53-week years, and what ISO 8601 is covers the date format itself.

How to change the first day in Google Calendar, Apple Calendar and Outlook

All three apps let you pick the day. The paths below come from each company’s help pages.

App	Where the setting is	Default
Google Calendar	Settings, View options, “Start week on”, per Google Calendar Help	Not stated on that page
Apple Calendar on Mac	General settings, “The day on which to start the week in Week, Month, and Year view”, per Apple Support	Not stated on that page
Outlook	“First day of week” list; click a day, per Microsoft Support	Sunday

If several people share one calendar, change the setting on each person’s device. The setting changes how the grid is drawn, not the events in it.

Which layout fits your week?

No source we checked declares one layout better. These are the decision points the facts support:

1. You use ISO week numbers. Pick Monday first, since ISO weeks run Monday to Sunday and a Monday-first row matches one ISO week.
2. Your tools default to Sunday. Outlook does, so a Sunday-first printed calendar matches what you see on screen unless you changed the setting. Fresh Calendars’ printables across the site are Sunday-start, and the Monday-start version is at the printable linked below.
3. You want the weekend together. In a Monday-first grid, Saturday and Sunday are adjacent at the right edge.
4. You print a month that starts on a Sunday. Sunday first uses fewer rows for November 2026, which leaves one fewer row to fit on the sheet.

When you can’t decide, print one month both ways and compare them. The Monday-start calendar guide explains how our Monday-first sheets are laid out, and how to print a calendar walks through printing either layout.