The time element of the Date Time picker always opens as 12:00 am whatever time was initially in the field.

All our settings are for a 24 hour clock - the Date Time picker uses a 12 hour clock:
Time Format HH:mm 14:54
Day Format yyyy-MM-dd 2006-09-04
Complete Date/Time Format yyyy-MM-dd HH:mm 2006-09-04 14:54
Day/Month/Year Format yyyy-MM-dd 2006-09-04
Date Picker Format (javascript format) yyyy-MM-dd (%Y-%m-%d) 2006-09-04
Date Time Picker Format (javascript format) yyyy-MM-dd HH:mm (%Y-%m-%d %R) 2006-09-04 14:54

When changing the time with the Date Time picker, the time element always returns "%R" instead of the selected time.

The time can however be directly overtyped in the field so problem not blocking.