Hi!
What about our old friend Excel?
It's great for logging the data, and calculate IFR, multi and specific type time. And I don't see why it wouldn't be ok for an interview or authorities.
And there is always a current easily available version, and supported by a big company, which can be used for a million of things. Otherwise you have to spend some cash in a just-for-logging-your-flight-time program which in 4 or 5 years could be dated (and there is now new versions 'cos the sofware developer went bankrupt) and you would need to enter all the data in a brand new program. Of course... if you are asked to e-mail a summary of your flight time you would just have to attach an Excel file.
What are your opinions/experiences?
Regards,
Pablo