This basics of business letters are important because certain formulae are recognized and handled accordingly. Under Standards and formats, do one of the following: To start the calendar week on Sunday, click English (United States). To start the calendar week on Monday, click English (United Kingdom). Note: This option also controls the display of dates, time, numbers, and currencies on your computer. Do more with Shutterstock Variety Over 60 million photos, vectors, illustrations, and more. Customize Your Calendar PDF Receive email updates whenever is updated.No spam, we promise. Vectors, or eps files are included in the price of your purchase.