The first day of week in calender view depends on your locale, but this plug-in let you select Sunday or Monday. This is a personal (per user) setting so that everyone can choose it as he/she likes.
For more information, read SDKForum837.
Install
Download the zip file from the link below.
Log in to your TeamPage and open Server Settings > Plugins page. Select the zip file, and upload it.
You will see that "First Day Of Week Changer" in the installed plugins list.
Setting
Server admins can configure all users' default from Server Setup > Plugins page.
Each user can configure his/her setting from his/her Account Setting (Personal Setting) > Plugins page.
Click "Configure" link in "First Day Of Week Changer" plugin.
You will see the configuration view like this.
Click "First Day of Week" drop-down-list. These options are available.
Auto ... The first day depends on your locale.
Sunday ... Each week starts from Sunday. The locale setting is ignored.
Monday ... Each week starts from Monday. The locale setting is ignored.
After selecting the option, click "Apply" button.
Example Screenshot
If you choose "Monday", your calendar will be displayed like this.