The following is a -very- accurate time conversion table. Instead of the simple 365 days in a year, I've calculated it using 8 decimals of accuracy! So if you want to know how many seconds in a millennium, yeah, I've got it, AND with decimals! I even did it in reverse, so you can know how many years are in a day! Now this is anal! To use it, pick the time unit you want to start with on the left of the table below. Then, move to the column of the time unit you want to convert to. Example: Suppose I want to find out how many minutes are in a year, I'd first find minutes in the first column. Then I would move over to the column marked year. This would give me the number: 525,948.7662432. Thusly, there are Five-hundred twenty-five thousand, nine-hundred and forty eight point seven six... minutes in a year.

 Millennium Century Decade Year Month Week Day Hour Minute Second Millenniums 1 0.1 0.01 0.001 0.00008333 0.00019165 0.00000273 0.00000011 0.000000001 0.00000000003 Centuries 10 1 0.1 0.01 0.00083333 0.00019165 0.00002737 0.00000114 0.00000001 0.0000000003 Decades 100 10 1 0.1 0.00833333 0.00191653 0.00027379 0.00001140 0.00000019 0.000000003 Years 1,000 100 10 1 0.08333333 0.01916536 0.00273790 0.00011407 0.00000190 0.00000003 Months 12,000 1,200 120 12 1 0.22998437 0.03285476 0.00136894 0.00002281 0.00000038 Weeks 52,177.4569 5,217.74569 521.774569 52.1774569 4.34812141 1 0.14285714 0.00595238 0.00009920 0.00000165 Days 365,242.19878 36,524.219878 3,652.4219878 365.24219878 30.43698498 7 1 0.04166666 0.00069444 0.00001157 Hours 8,765,812.77072 876,581.277072 87,658.1277072 8,765.81277072 730.48439756 168 24 1 0.01666666 0.00027777 Minutes 525,948,766.2432 52,594,876.62432 5,259,487.662432 525,948.7662432 43,829.0638536 10,080 1,440 60 1 0.01666666 Seconds 31,556,925,974.592 3,155,692,597.4592 315,569,259.74592 31,556,925.974592 2,629,743.831216 604,800 86,400 3,600 60 1