> > where in the bible does it tell which calendar, religious or civil, was in place in Noah’s day???
It was the Civil Calendar.First, we know that there was a calendar in Noah’s day. Years, months and days had been recorded ever since Adam was created. Then the Lord changed the first month from Tishri to Nisan when the Israelites were at Mt. Sinai.Gen 7:11 In the six hundredth year of Noah's life, in the second month, the seventeenth day of the month, the same day were all the fountains of the great deep broken up, and the windows of heaven were opened.”At that time, the first month was Tishri, which is starts in September or October. The second month was Cheshvan.Gen_8:13 And it came to pass in the six hundredth and first year, in the first month (Tishri), the first day of the month, the waters were dried up from off the earth: and Noah removed the covering of the ark, and looked, and, behold, the face of the ground was dry.”Abraham was born 2 years after Noah died.THE CHANGE IN THE CALENDARAfter Abraham’s descendants left Egypt in Nisan, and were at Mt. Sinai, the Lord said,Exo_12:2 This month (i.e., Nisan) shall be unto you the beginning of months: it shall be the first month of the year to you.Both calendars, Sacred and Civil, were kept from that time on. Joel 2:23 says, "Be glad then, ye children of Zion, and rejoice in the LORD your God: for he hath given you the former rain moderately, and he will cause to come down for you the rain, the former rain, and the latter rain in the first month.”Jesus came as the former rain (i.e., he was born on Tishri 1, 3757, Sept 4, 5 BC; Julian), and I think he will return as the latter rain, Nisan 1, 5776, April 9, 2016 (Gregorian). April 9 is the anniversary of Jesus’ resurrection on April 9, 30 AD (Julian).The Gregorian was a correction to the Julian calendar, which did not allow enough leap years. Ten days were dropped.“The motivation for the Gregorian reform was that the Julian calendar assumes that the time between vernal equinoxes is 365.25 days, when in fact it is presently almost 11 minutes shorter. The discrepancy results in a drift of about three days every 400 years. At the time of Gregory's reform there had already been a drift of 10 days since Roman times, resulting in the spring equinox falling on 11 March instead of the ecclesiastically fixed date of 21 March, and moving steadily earlier in the Julian calendar.” (Wikipedia)Ex_12:18 In the first month, on the fourteenth day of the month (i.e., Passover, Nisan 14) at even, ye shall eat unleavened bread, until the one and twentieth day of the month at even.”Lev_23:5 In the fourteenth day of the first month at even is the LORD'S passover.”Est_3:7 In the first month, that is, the month Nisan, in the twelfth year of king Ahasuerus, they cast Pur, that is, the lot, before Haman from day to day, and from month to month, to the twelfth month, that is, the month Adar.”Agape,Marilyn Ageeprophecycorner.theforeverfamily.com