Duplicate issue below

The description pretty clearly states:

For the purpose of this Kata, a year is 365 days and a day is 24 hours.

Furthermore, you don't need to worry about months. Again, the description says:

... the duration is expressed as a combination of years, days, hours, minutes and seconds.

No mentioning of "month" anywhere...

edit: moved the note about years a bit higher up in the description, to make it more obvious