This year is a Jewish leap year. There are two months of Adar..

This year is a Jewish leap year. There are two months of Adar..

Adar I is.... the 12th month
Rosh Chodesh Adar / ראש חודש אדר
Beginning of new Hebrew month of Adar. Adar is the 12th month of the Hebrew year. Corresponds to February or March on the Gregorian calendar.
Rosh Chodesh Adar begins at sundown on Mon, 04 February 2019.

Last year Adar I started on 2/14 (Parkland shooting day)
Rosh Chodesh Adar begins on:
Wed, 14 February 2018 at sundown (30th of Sh'vat, 5778)


Adar II is.... the 13th month

Rosh Chodesh Adar II / ראש חודש אדר ב׳
Beginning of new Hebrew month of Adar II (on leap years). Adar II (sometimes "Adar Bet" or "Adar Sheni") is the 13th month of the Hebrew year, ocurring only on leap years. Corresponds to February or March on the Gregorian calendar.
Wed, 06 March 2019 at sundown (30th of Adar I, 5779)
Rosh Chodesh Adar II begins at sundown on Wed, 06 March 2019.

Last year Adar I started on 2/14 (Parkland shooting day)
Rosh Chodesh Adar begins on:
Wed, 14 February 2018 at sundown (30th of Sh'vat, 5778)

Jewish leap years are called "pregnant years"
https://www.chabad.org/calendar/view/day.asp?tdate=02/06/2019