Flood ends where the next day is the first day on the new earth
 and it is the same day as Christ's Resurrection, Feast Of First Fruits

17th of Nisan

The Ark rested on the 17th day of the 7th month.  In Genesis 8:4 "And the ark rested in the seventh month, on the seventeenth day of the month, upon the mountains of Ararat."  This month becomes the first month replacing Tishri.  The flood is over The next day is the 18th of Nisan which is when Noah exits the Ark and it is also the same day of Jesus Christ's Resurrection.

Notes:

Jewish Calendar

In Exodus 12:1-2 "Now the LORD said to Moses and Aaron in the land of Egypt, 'This month shall be the beginning of months for you; it is to be the first month of the year to you.' ", the calendar was changed.  God was speaking to Moses and Aaron regarding the Passover.  In Exodus 12:5-6 "Your lamb shall be an unblemished male a year old; you may take it from the sheep or from the goats.  You shall keep it until the fourteenth day of the same month, then the whole assembly of the congregation of Israel is to kill it at twilight."

The First and older Calendar

The month of Tishrei is the month that "Adam and Eve were created" and was the first month prior to Exodus 12:1-2.

  Month Old New # of days Civil Equivalent to New Special Dates
  Tishrei, Tishri, (Ethanim) 1 7 30 September - October High Holidays: (Rosh Hashanah & Yom Kippor), Sukkot, Shmini Atzeret and Simchat Toray
  Cheshvan, (Bui) 2 8 29 or 30 October - November  
  Chisleu (Kislev) 3 9 30 or 29 November - December Chanukah
  Tevet 4 10 29 December - January Conclusion of Chanukah
  Sh'vat ~ Shevat 5 11 30 January - February Tu B'Shavt
  Adar 1 6 12 30 February - March Purim
  Adar (Adar Beit in leap years)   12 13 February - March  
--> Nisan, (Aviv) 7 1 30 March - April Passover
  Iyar, (Zif) 8 2 29 April - May Lag B'Omer
  Sivan 9 3 30 May - June Shavuot
  Tammuz 10 4 29 June - July  
  Av 11 5 30 July - August Tisha B'Av
  Elul 12 6 29 August - September  

 

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