With the 2018 update to the UI you have greater control of your date and time settings. The Date and Time setting are still under the ‘My Account’ section, but the link to your ‘My Account’ can now be found in the top right hand nav. Once you are in ‘My Account’ section, scroll down to the Date and Time Settings. You can now modify the format for both date and time, specify the first day of the week, and change the time zone.