I just noticed that if you use control centre to change the text size the clock corrects itself on iPhone 6s and iPad Pro 9.7” that both had this problem.
4c21
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Same here already reported on IOS14 iPhone 6s but now also happening on IPadOS14 on original iPad Pro 9.7”. Clock runs slow. For those that don’t know you can change the time zone location independently of the device time zone by simply pressing and holding the widget and selecting ‘Edit Widget’. You can temporarily fix the clock by selecting another time zone city then changing to back again.