Further to the discussion at my earlier topic, I have now forked hourglass as time-hourglass.
time-hourglass-0.2.12 is an almost carbon copy of hourglass-0.2.12. In its test-suite, I had to replace long-gone parseTime (from package time) with parseTimeM True to get it to compile. The next minor versions of time-hourglass will then bring things up to date.