Using Roman calendar years just wont work, although the tracking of astronomic events is done by NASA using the Julian calendar.
The Rabbis have a calendar translate program forThere is some question about the abib in 2012 in the land.
shalom b'SHEM Yah'shua HaMashiach
converting between the Julian and Hebrew calendars.
You cannot “convert” from any man made calendar to Yehova’s calendar, as his calendar contains variables for weather blocking the visibility of the new moon, and also retarding the maturation of the barley.
The Aviv moon of 2012 was observed after sundown on March 23, at 9.87 degrees of elevation, and 1.1% of illumination.