How to Change First Day of Week in Windows 10
Windows 10 sets the first day of the week based on your region format settings by default.
If Windows 10 is showing the wrong first day of the week for your location, or you just want change it to a different day, you can manually change the date and time format settings to do so.
This tutorial will show you how to change the first day of week for your account in Windows 10.
CONTENTS:
EXAMPLE: Sunday and Monday set as first day of week in Windows 10

OPTION ONE
Change First Day of Week in Settings
1. Open
Settings, and click/tap on the
Time & language icon.
2. Click/tap on
Date & time on the left side, and click/tap on the
Change date and time formats link under the
Formats section on the right side. (see screenshot below)
Starting with Windows 10 build 17686, you would click/tap on Region on the left side instead.
3. Select the
First day of week you want from the drop menu. (see screenshots below)
4. You can now close Settings if you like.
OPTION TWO
Change First Day of Week in Control Panel
1. Open the
Control Panel (icons view), click/tap on the
Region icon, and close the Control Panel if you like.
2. In the
Formats tab, click/tap on the
Additional settings button. (see screenshot below)
3. Click/tap on the
Date tab, select the
First day of week you want from the drop menu, and click/tap on
OK. (see screenshots below)
4. Click/tap on
OK. (see screenshot below)
OPTION THREE
Change First Day of Week using a REG file
The downloadable .reg files below will modify the string value in the registry key below.
HKEY_CURRENT_USER\Control Panel\International
iFirstDayOfWeek string value (REG_SZ)
0 = Monday
1 = Tuesday
2 = Wednesday
3 = Thursday
4 = Friday
5 = Saturday
6 = Sunday
[/note]
1. Do
step 2 (Sunday),
step 3 (Monday),
step 4 (Tuesday),
step 5 (Wednesday),
step 6 (Thursday),
step 7 (Friday), or
step 8 (Saturday) below for what you want as the first day of the week.
2. To set Sunday as first day of the week
A) Click/tap on the Download button below to download the file below, and go to
step 9 below.
Set_Sunday_as_first_day_of_week.reg
Download
3. To set Monday as first day of the week
A) Click/tap on the Download button below to download the file below, and go to
step 9 below.
Set_Monday_as_first_day_of_week.reg
Download
4. To set Tuesday as first day of the week
A) Click/tap on the Download button below to download the file below, and go to
step 9 below.
Set_Tuesday_as_first_day_of_week.reg
Download
5. To set Wednesday as first day of the week
A) Click/tap on the Download button below to download the file below, and go to
step 9 below.
Set_Wednesday_as_first_day_of_week.reg
Download
6. To set Thursday as first day of the week
A) Click/tap on the Download button below to download the file below, and go to
step 9 below.
Set_Thursday_as_first_day_of_week.reg
Download
7. To set Friday as first day of the week
A) Click/tap on the Download button below to download the file below, and go to
step 9 below.
Set_Friday_as_first_day_of_week.reg
Download
8. To set Saturday as first day of the week
A) Click/tap on the Download button below to download the file below, and go to
step 9 below.
Set_Saturday_as_first_day_of_week.reg
Download
9. Save the .reg file to your desktop.
10. Double click/tap on the downloaded .reg file to merge it.
11. When prompted, click/tap on
Run,
Yes (
UAC),
Yes, and
OK to approve the merge.
12. You can now delete the downloaded .reg file if you like.
That's it,
Shawn