Instruction
1
Divide the numeric value of the yearand 4. Those yearand that will not be a multiple of 4, do not apply to leap year.
Example.
2008 year / 4 = 502
2011 year / 4 = 502,75
2008 year is a leap year (evenly divided), according to the rule of step 1, 2011 is not a leap year (divisible with remainder).
Example.
2008 year / 4 = 502
2011 year / 4 = 502,75
2008 year is a leap year (evenly divided), according to the rule of step 1, 2011 is not a leap year (divisible with remainder).
2
After successful completion of step 1, divide the numeric value of the yearand on 100.
If the year is divisible by 100 without remainder, this year will not be a leap year, even if it was successfully divided into 4.
Example.
2104 year / 4 = 526
2104 / 100 = 21,04
2104 year is a multiple of 4 but not multiple of 100 (when the division turned out the rest).
According to the rule of step 2, it is a leap year. 2100 year / 4 = 525
2100 / 100 = 21
2100 a year is a multiple of 4 but a multiple of 100. According to the rule of step 2, it is not a leap year.
But here too there may be exceptions. For more accurate calculation, follow step 3.
If the year is divisible by 100 without remainder, this year will not be a leap year, even if it was successfully divided into 4.
Example.
2104 year / 4 = 526
2104 / 100 = 21,04
2104 year is a multiple of 4 but not multiple of 100 (when the division turned out the rest).
According to the rule of step 2, it is a leap year. 2100 year / 4 = 525
2100 / 100 = 21
2100 a year is a multiple of 4 but a multiple of 100. According to the rule of step 2, it is not a leap year.
But here too there may be exceptions. For more accurate calculation, follow step 3.
3
Need year, the numerical value which was a multiple of 4, and 100 divided by 400. If it divided without a remainder, then the year, after all, a leap!
Example.
2100 year / 4 = 525
2100 / 100 = 21
2100 / 400 = 5.25 in
2100 year not divisible by 400, then, according to all the rules, he's not високосный2000 year / 4 = 500
2000 / 100 = 20
2000 / 400 = 5
2000 year evenly divisible by 4, 100, but at 400. Consequently, according to the rule of step 3, it is a leap.
Example.
2100 year / 4 = 525
2100 / 100 = 21
2100 / 400 = 5.25 in
2100 year not divisible by 400, then, according to all the rules, he's not високосный2000 year / 4 = 500
2000 / 100 = 20
2000 / 400 = 5
2000 year evenly divisible by 4, 100, but at 400. Consequently, according to the rule of step 3, it is a leap.
Useful advice
To date, the rule for computing a leap year is limited to step 3 and shall, after the adoption of the Gregorian calendar. Such an algorithm would have to be developed because the year accumulated extra minutes, which in a few centuries has led to a shift in the calendar relative to the equinox days.
