This is based on the asumption that Messiah Ministry was 3 and 1/2 years as Daniel the Prophet has writen.
Those who support 'the lunar shabbat' state that year 28-29 was a shemitah and if we add 3 and 1/2 years then we have year 31-32 as 'passions year' and 29-30 as jubilee and 2029-2030. Then we get 14 Nisan 3792, Monday or Thuesday, since Adar or Adar-B can have 29 or 30 days if then the leap year was not taken in consideration and so taking out the day for the new season 14 falls Sunday wich is not the case, so we go with Thuesday.Then we have 3 days and 3 nights in tomb literaly according the Parable of Jonah. With this there is a contradiction since in the Gospels states He was in Tomb in the preparation of Shabbat and Messiah risen the morrow to Shabbat according Leviticus 23:11. There is a contradiction in Leviticus 23:3 were says 'do no work' and in the first day of the festival 23:6 says 'do no servile work' witch not applies around every 7 years when 15 Nisan falls Saturday and in the modern calendar falls in shemitah - sabatical years - how was adopted in Israel after 2014.
Those who support 'the weekly shabbat' state that year 29-30 was a shemitah and if we add 3 and 1/2 years then we have year 32-33 as 'passions year' 3793 and 29-30 as jubilee and 2030-2031. Then we get 14 Nisan 3793, Thursday or Friday, since Adar can have 28 or 29 days. Then we have 3 days according Luke 24:20-21 since the chief priests and the rulers delivered Him to be condemned to death, and impaled Him, and Messiah was only Saturday in the Tomb, from Friday evening according to Mark 15:42, and Luke 23:54, and was near Sunset according John 19:31 and Deuteronomy 21:22-23, and He resurected in the morrow to Shabbat (mehorot bShabbat) according to Matthew 28:1 and according Aramaic Peshitta on the day one in the week, and according Luke 24:1 and John 20:1, and according Leviticus 23:11.
If we go with the first version 2014-2015 is shemitah and with the second 2015-2016.