I have my Matomo dashboard set to default to "today", and the string "today" appears in a query field of the URL when I go to the dashboard. When I go to the dashboard, I get the current day's stats under "Visits overview" but the previous day's graph under "Visits over time," and the previous day's date is shown in the drop-down date selector widget. But if I manually select the current date, I get the current date shown in the URL and the date selector, and the graph shows today's statistics. Choosing the string value "today" as a default has a different effect from explicitly selecting the current date; some parts of the dashboard use the previous day's date when "today" is the default.

See screenshot - Matomo is configured to use "today," as seen in the URL; and as seen in the live visitor log, today is December 1; but the date-selector widget has defaulted to November 30.

I don't believe that this is caused by a time zone issue; all my time zones match, and all aspects of it appear to roll over at midnight local time every day. It seems to be new behaviour in 3.7.0; the previous version correctly showed today's stats in all parts of the dashboard when so configured.