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Message: <blockquote data-quote="Sword of Spirit" data-source="post: 6678416" data-attributes="member: 6677017">There are a variety of official points where the time of X event on World A = the time of Y event on World B. Most of that is from the 2e era. Because we are dealing with lots of people creating this material (novels are one of the main sources) there are discrepancies, but it is still possible to create a fairly consistent multiverse timeline by selecting which sources you lend more weight to (ie, Spelljammer products take precedence, or the Forgotten Realms is the gold standard for time, etc).The two main timelines I looked at were the Spelljammer one linked to above and another one that focuses on the Forgotten Realms, while still including other settings, called A Temporal Chronology of the Primes. The original site is down, but the Wayback Machine is your friend.I like the Spelljammer one better, but I eventually decided to just go with my own points of correspondence. Decide what date in each world I want to be Date X, and say those all correlate as the same date. (And these chronologies are close enough that the variances between chronologies are not huge. For instance, the "current events" represented by products set in the Forgotten Realms, Greyhawk, and Dragonlance books were all assumed to be taking place within a couple decades of each other.)You will not find anyone attempting to take into account varying lengths of years and such. That is a fool's undertaking. Instead, you can come up with something close enough for most fantasy needs by doing something like this: Number each day of the year. Start at the winter solstice or whenever, and go from 1 to 364/365. For calendars of different lengths, spread out or condense those days.You now know that 13__ Dale Reckoning is the same as 5__ Greyhawk time. You are in the Realms on day 34 of the year. If you go to Oerth, it is whatever day of their year is labeled "34". If you visit a world with a shorter calendar like Krynn, maybe there isn't a day 34. Maybe it jumps from 33 to 35. Flip a coin as to which day you arrive at. If you go to a long calendar world like Athas, maybe there are two days that are both "Day 34". Flip that coin. The point is that your solstices and equinoxes line up and your years are magically the same length. I recommend having day and night synchronized on all worlds. It is magic, so it's okay if the multiverse keeps things aligned in mystically relativistic ways.So yes, others have made good attempts at it, and it is rather fun to play with.</blockquote>

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