Assignments and Section Info have different methods of selecting times, viz.:
Assignments: 3 drop-down list boxes (hh, mm, am/pm)
Section Info: freeform text input box for hh:mm, am/pm radio buttons
While the Style Guide does not appear to define a correct method, it creates a poor user experience to have different input methods in different tools.
While the Assignments style is somewhat limiting in the current implementation as it only provides time options in 15-minute intervals (0, 15, 30, 45), the am/pm selection style could be consistent at the very least.