#40 Time display is incomplete when using 10 min intervals

[Ben King]

When using 10 minute display intervals, e.g. signup_interval = 0.166666666; dayview_interval=0.166666666
the hour is not displayed (but minutes are) for some of the rows in both day and week calendar views. I suspect this is related to the repeating decimal. Using fewer decimal points, like 1.666, does not fix the problem.
It works fine at 0.05 and 0.25 - but we need 10 min intervals!

Thanks for helping with this minor problem of this excellent program!

p.s I tried 3.7 beta - it has the same bug