Left the timer running in Harvest overnight...

harvover.py

#!/usr/bin/python

def hrs(curr_entry, left, started):
  amt_sub = (24. - left) + started
  return curr_entry - amt_sub

if __name__ == '__main__':
  import sys

  usage = (
    "Usage:\n\n"
    "  ./harvover.py [yesterday's entry amount] "
    "[time left yesterday] [time started today]\n"
    "  All times given on 24-hour scale in decimal.\n"
    "  Returns the correct amount for the entry you left running.\n"
  )

  if len(sys.argv) < 4:
    print usage
  else:
    args = [float(a) for a in sys.argv[1:]]
    print hrs(*args)