Currently, there are 442 conversions possible. Go into 'Help' mode and tap 'fur'. Then, visit the WEB site mentioned above to read about the history of the furlong. Don't ask me why I put furlongs and fornights into the program. FN is my own abbreviation for fortnight since there is no official one.
Time is tricky.
A year can be 365 or 366 days. A month can range from 28 to 31 days. It is a traditional unit of liquid volume, called the fluid ounce to avoid confusion with the weight ounce. A fluid ounce of water weighs just a bit more than one ounce avoirdupois. Drop me a line.