Where this year falls in the 19-year cycle
How the Hebrew calendar works
A Hebrew month starts at the new moon and lasts 29 or 30 days. Twelve such months are about 11 days shorter than a solar year, so a 13th month, Adar I, is added seven times in every 19 years to keep Pesach in spring. The year number changes in Tishrei, though the months are counted from Nisan.
About the Hebrew calendar
What Hebrew year is it now?
It is 5787 (תשפ״ז).
When does the Hebrew day start?
At sundown. That is why Shabbat and every holiday begin on the evening before the civil date shown in the calendar.
What is a Jewish leap year?
A year of 13 months, with Adar I and Adar II. It falls in years 3, 6, 8, 11, 14, 17 and 19 of each 19-year cycle.