Tu B’Shvat is the day that determines how we are to take off תרומות ומעשרות, the tithings from the fruit of our fields. These laws apply today in Eretz Yisrael.
We are to be careful to purchase our produce from places where they take off these tithes and post a certificate that verifies this. If such tithes were not removed, we must learn how to do this ourselves.
Nowadays, these laws are rabbinical. However, when the majority of the Jewish people are living in Eretz Yisrael, these laws become Torah laws. This has not happened in over two thousand years. Many predict that this will happen in the year 2030, only eleven years from now.
This is but another proof of how fortunate we are to be living in such incredible times.