A watch face that shows Decimal time (in blue) as well as 'Normal' time (in green).
Forerunner 55 with just the Decimal time showing
Fenix 8 with Decimal and 'Normal' time showing one above the other (Decimal time above)
MARC 2 showing settings menu with the Style set to one above the other
Venu 3 with Decimal and 'Normal' time showing side by side (Decimal to the left)
Approach S70 with Decimal and 'Normal' time showing angled (Decimal to the left and above)
Forerunner 165 with Decimal time full size and 'Normal' inset
Venu 2 Square with 'Normal' time full size and Decimal inset
Venu 2 with just the 'Normal' time showing
Decimal time is shown in blue, there are 100 hours per day,
100 minutes per hour and 100 seconds per minute.
'Normal' time is shown in green.
The Decimal time calendar has 10 days per week and 365 days per year with leap year.
For more information on Decimal tim see: https://www.decimal-time.org/