Please note there is a critical error (bug) in the current version of Work Time that will cause the app to crash a lot when the temperature is set to Celsius. I’ve fixed the error and resubmitted to apple but due to apple taking off a week during the Holidays I do not think it will be approved until the first week of January.
In the meantime I suggest you use the app with only the Fahrenheit setting, and wait until the next version is approved.
If this is untenable, I can send you a fixed version if you are willing to sign up as a Beta tester. Please email me at: