Who changed the date from BC to AD ,Why did they change it?
438529
I don't know who...but I can answer why. It is a simple matter of history. There was a dscision to define periods of history...BC...now BCE (for Before Christian Era) is an arbitrary division...\nAnd don't think this happened in the year Zero...it happened much later. \nThink of it this way...its like a book shelf that you are putting in order...this way you know where to history books are...the cook books..etc. Now you know if it happened before or after Christ's birth.\nWhy Christ? Cause this is a western calander system...in the far east they use a different calander with different time.  Hope this helps\n\n\noh and AD is latin...for in the Year of Our Lord
861735
It actually depends on where in the world you are. If you're in the U.S. or anywhere in North America, that date would be February 10th, 2007. But if you're in England or India or at MOST English colonies (places that were once ruled by England), it would be October 2nd, 2007.\n\nThey should really pick one to be standard in order to prevent confusion.
78637
the romans,its refered to as the julian calendar
223984
By the 15th century the Julian calendar had drifted behind the solar calendar by about a week, so that the vernal equinox was falling around March 12 instead of around March 20. Pope Sixtus IV (who reigned from 1471 to 1484) decided that another reform was needed and called the German astronomer Regiomontanus to Rome to advise him. Regiomontanus arrived in 1475, but unfortunately he died shortly afterward, and the pope's plans for reform died with him. \n\nThen in 1545, the Council of Trent authorized Pope Paul III to reform the calendar once more. Most of the mathematical and astronomical work was done by Father Christopher Clavius, S.J. The immediate correction, advised by Father Clavius and ordered by Pope Gregory XIII, was that Thursday, Oct. 4, 1582, was to be the last day of the Julian calendar. The next day would be Friday, Oct. 15. For long-range accuracy, a formula suggested by the Vatican librarian Aloysius Giglio was adopted: every fourth year is a leap year unless it is a century year like 1700 or 1800. Century years can be leap years only when they are divisible by 400 (e.g., 1600 and 2000). This rule eliminates three leap years in four centuries, making the calendar sufficiently accurate. \n\nIn spite of the revised leap year rule, an average calendar year is still about 26 seconds longer than the Earth's orbital period. But this discrepancy will need 3,323 years to build up to a single day.
531771
that's what happens when the Romans take and change a religion. but with out them it would have died out and we wouldn't have Christmas's or Easter or any of that as they are really old roman pagan holidays that were at first banned, then reworked by the new Cristian religion.
109931
well..here it is..\n\nEveryone thinks they know the origin of Valentine's Day. According to the most commonly accepted story, Emperor Claudius of Rome issued a decree forbidding marriage in the year 271. Roman generals had found that married men did not make very good soldiers, because they wanted to return as quickly as possible to their wives and children-and they didn't want to leave them to fight the emperor's battles in the first place. So Claudius issued his edict that there should be no more marriages, and all single men should report for duty.\n \nA priest named Valentine deemed such a decree an abomination, and he secretly continued to marry young lovers. When Claudius learned of this extreme act of disobedience to his imperial command, he ordered the priest dragged off to prison and had him executed on February 14.\n \nFather Valentine, the friend of sweethearts, became a martyr to love and the sanctity of marriage, and when the Church gained power in the Roman Empire, the Holy See was quick to make him a saint.\n \nThe early Church fathers were well aware of the popularity of a vast number of heathen gods and goddesses, as well as the dates of observation of pagan festivals, so they set about replacing as many of the entities and the holidays as possible with ecclesiastical saints and feast days. Mid-February had an ancient history of being devoted to acts of love of a far more passionate and lusty nature than the Church wished to bless, and the bishops moved as speedily as possible to claim the days of February 14 through 17 as belonging to Saint Valentine, the courageous martyr to the ties that bound couples in Christian love.
121881
Per Wikipedia:\n\n Augustus is alleged to have removed one day from February and added it to August, (renamed from Sextilis to honor himself), so that Julius Caesar's July would not contain more days.
1001502
All I know is that the Greeks started their dates from the first Olympic Games which was around 770 BC.  So using that calendar the year 1 (as we know it) would've been 770, and we are currently in 2776 (or somewhere thereabouts).  Of course there were many different calendars at use at the time from various parts of the world, and I think a few years have either been added or taken away from our calendar over the centuries.\n\nI'm sure that if you did some research into Roman, Greek and Egyptian ( I mean, they were around for at least two thousand years before Jesus) history you could find out more.
133309
Before a standard calendar, generally dates were refered to by who-ever was in charge and by the month of the season.  So today would be:\n\nThe 10th day of the 2nd month of the 6th year of the Presidency of George W. Bush.\n\nIt gets a little confusing, but is fairly accruate.\n\nBCE came into being when people realized that not everyone accepted AD (anno domini - Year of God in Latin).  In fact there are several calendars out there.  so BCE and CE have been accepted as the "norm" for all dates in anthropology and archaeology.\n\nI think Rome came up with the first one for months, but still refered to the years as "in the reign of [insert name here]"
1068551
Greek Columns were imprecise to give the optical illusion of precision.  Roman Roads that were laid down with great effort by some folks to make the transit of other folks easier and more efficient.  The Gregorian Calendar which was derived from inaccurate predecessors, but deemed to be more accurate and therefore better without actually resolving any fundamental flaws.  \n\nTaken as a whole, these examples clearly demonstrate that you can reasonably botch a project in terms of implementation, resources or timeline and still come up with something historically famous and noteworthy.  And while it helps to have imperial- or papal-grade authority to force your screw-up on the masses, it's not required if your project simply looks good enough to be appealing to the average citizen.
335118
Yes, there was a year 1 AD, though at the time they did not call it that.  Around the 6th century, it was decided by the Church that dates should start from what they estimated to be the birth of Christ-but of course that was around 500 years after the fact, so in the year 1 AD (500 years before) they didn't have any idea that someday that year would be considered 1 AD.  That is far from the start of time, though, since it was only 2006 years ago.  Regardless of whether you believe in God and creation, or in the big bang, both believe there was a point at which time started.  For the big bang, its estimated anywhere from 14 billion years (classic view) or 20+ billion years (newer hypothesis based upon the inflation model). For conservative Christians, the date is something like 6000 years, and for other religions it is different as well.
159923
February 12th, according to the Almanac.
40025
It is commonly thought that BC stands for "before Christ" and AD stands for "after death." This is only half correct. \n\nBC does stand for "before Christ." \nAD actually stands for the Latin phrase "anno domini" which means "in the year of our Lord."  \n\nThis system doesnt exist in the Bible and wasnt implemented and accepted until several centuries after Jesus' death.
1147390
In England, 1752 (a leap year) only had 355 days in it, As September 2nd was followed by September 14th so as to change from the  Julian to the Gregorian calendar,
54310
It is most likely because that was the date the consulship of Rome changed hands during the Roman Republic, and it was also when interest was compounded for loans. Western European countries displayed their calendars from January to December after the Roman tradition, and thus January 1st became New Years Day.
293987
Hi, I found this site, about half way down the page is a heading reading "How the Romans Changed Britain".  It's a small section, but should house alot of information.  There's also information on the architecture brought north by the Romans.  This page should be pretty helpful.  Good luck.
76942
There are even today many different ways of figuring out time. For example this weekend, on 29th Jan the chinese new year starts. It is Year 4703 by the Chinese calendar. And it is the jewish year 5677.\nAnd even the christian calendar has been modified a couple of times. The gregorian calendar reform was adopted in 1582 but not in England and so also not in the US, they only changed in 1752 (so they lost 11 days).\nWhich year we are in is only relative to what you want to measure. If you want to be more explicit you don't just say B.C. (Before christ) but B.C.E (before the christian era). As long as you can figure out how far apart they are you can easily convert one into the other and allow for changes. \nFor time of the year (month/day) it is probably best to go by a system like now, which is constant with and corresponds to the seasons of the year. So while George Washington was born on the 22nd feb 1732, his parents must have thought it was the 11th when he was born. \nI don't know how far historic dates get modernized to reflect calendar changes.