I'm working with the Google Charts API to create a graph of a student's test-taking performance. On the X axis, the graph shows the days of the week. On the Y axis, the graph shows how long the student spent taking the exam. (The goal is for teachers to see if the student speeds up). However, I have a problem:
My data is in the timeofday format, and I'm providing values to the chart as time durations using the Google Charts [HH,MM,SS,MSEC] format. When the chart renders, the Y axis is printed as "HH:MM:SS". I'd really like to customize that because the seconds are pretty useless and it looks messier than I'd like.
The Charts API says you can specify a "pattern" for a column, and I've specified "HH:MM". However, that doesn't seem to take effect at all. Anybody have experience formatting timeofday in Google Charts and know how to do this?