Yes a day for a year is held by some Adventists, Jehovahs Witnesses and the Worldwide Church of God while the great majority of textbooks of Biblical hermeneutics dont even mention the possibility of a year day Principle.
The following things are true about Numbers 14;34.
1.The word 'days' means days.
2. The word 'day' means day.
3. The word'year' meansyear.
4. The word 'years'means years.
The full artical can be found www.goodnewsunlimited.org.au/yr_day.htm This site and organisatrion is Good News Unlimited supported by some adventists that dont agree with the official line.
Barry