2001-2800 AD and if implementation occurs on Sun, Jan 1, 2012
| Leap years | Years elapsed | Days lost/year | Cumulative days lost | Days to add | Over/Under-rounding |
| Year 2000 was known as the 'Big Leap' (Leap day occurs every 4 years) | |||||
| 2004 | 4 | 0.2425 | 0.97 | 1 | +0.03 |
| 2008 | 4 | 0.2425 | 0.97 | 1 | +0.03 |
| 2009 | 1 | 0.2425 | -0.2425 | ||
| 2010 | 1 | 0.2425 | -0.2425 | ||
| 2011 | 1 | 0.2425 | -0.2425 | ||
| Implementation date: Sunday, January 1, 2012 | |||||
| 2012 | 1 | 1.2425 | -1.2425 | ||
| 2013 | 1 | 1.2425 | -1.2425 | ||
| 2014 | 1 | 1.2425 | -1.2425 | ||
| 2015 | 1 | 1.2425 | -1.2425 | ||
| Leap Week occurs every 7 years and Double Leap Week occurs every 28 years | |||||
| Year 2016-2044 accounts for an over-rounding of (0.25-0.2425)/year * 28 years = +0.21 days | |||||
| 2023 | 7 | 1.25 | 8.75 | 7 | |
| 2030 | 7 | 1.25 | 8.75 | 7 | |
| 2037 | 7 | 1.25 | 8.75 | 7 | |
| 2044 | 7 | 1.25 | 8.75 | 14 | |
| 28 yrs | -- | 35 days | 35 days | +0.21 | |
| Year 2045-2072 accounts for an over-rounding of (0.25-0.2425)/year * 28 years = +0.21 days | |||||
| 2051 | 7 | 1.25 | 8.75 | 7 | |
| 2058 | 7 | 1.25 | 8.75 | 7 | |
| 2065 | 7 | 1.25 | 8.75 | 7 | |
| 2072 | 7 | 1.25 | 8.75 | 14 | |
| 28 yrs | -- | 35 days | 35 days | +0.21 | |
| Year 2073-2100 accounts for an over-rounding of (0.25-0.2425)/year * 28 years = +0.21 days | |||||
| 2079 | 7 | 1.25 | 8.75 | 7 | |
| 2086 | 7 | 1.25 | 8.75 | 7 | |
| 2093 | 7 | 1.25 | 8.75 | 7 | |
| 2100 | 7 | 1.25 | 8.75 | 14 | |
| 28 yrs | -- | 35 days | 35 days | +0.21 | |
| Year 2101-2800 accounts for an over-rounding of (0.25-0.2425)/year * 700 years = +5.25 days | |||||
| ... | ... | ... | ... | ... | |
| 2779 | 7 | 1.25 | 8.75 | 7 | |
| 2786 | 7 | 1.25 | 8.75 | 7 | |
| 2793 | 7 | 1.25 | 8.75 | 7 | |
| 2800 | 7 | 1.25 | 8.75 | 14 | |
| 28 yrs | -- | 35 days | 35 days | ||
| +5.25 | |||||
| Net = +0.2425 | |||||
| See Adjustments for further explanations regarding Over/Under-rounding. | |||||
© 2009-2013 Marcus W.