The year was the time for the earth to revolve around the sun.
Year-based units include the olympiad (four years), the lustrum (five years), the indiction (15 years), the decade, the century, and the millennium.
We did all our best effort to ensure the accuracy of the metric calculators and charts given on this site. We cannot make a guarantee or be held responsible for any errors that have been made. Some unit transformations are converted automatically. Others are manually calculated. If you see an error on this site, please report it to us by using the contact page and we will try to correct it as soon as possible.