# Japan coin dating calander

Half of the combinations are not used, because they have different parity.Japanese coins are dated by ruling emperor (year of accession) plus the regnal year. EXAMPLE: 五 – 5 If a small number from Chart A is front a larger number from Chart B, you multiply the smaller number by the larger number.Take note of the other characters commonly on Japanese coins.Similar to Ethiopia, the year can be calculated from the numbers found in Step 3 by the following rule: If a number is followed by a smaller number, add.The symbols used to represent 0 through 10 are pictured below, with their European/Arabic equivalent: Numbers above (and including) 10 are not made by combining individual digits, like in the Arabic numeral system.Instead, Japanese uses combinations of numerals which add and/or multiply to the number being written.For example, 11 is not written 一一 (1 1) - it is 十一 (10 1, or 10 1). 20 is 二十 (2 10, or 2 * 10), and 22 is 二十二 (2 10 2, or 2 * 10 2).

There are additional Japanese symbols for larger multiples of 10: 100: 百 1000: 千 The Japanese number-writing system is known as a non-positional numeral system because individual symbols don't identify their value strictly based on their position in the number.

Emperor (Hirohito) regnal year (now L to R) = 5 x 10 6 = 56. Since the 1960s fifty yen and higher denomination coins use western numbers for the regnal year.

Japanese coins can be dated either in Japanese numerals or Arabic numerals.

If a number is followed by a larger number, multiply. Since the first year is year 1 and not year 0, you must subtract 1 before adding the number to the year found in Step 2 to get the Gregorian year.

The coins of the Chinese provinces didn't have a date as we understand it as a period of time elapsed since a moment defined as a time zero.

EXAMPLE: 五十 – 50 (五 is the numeral for 5 and 十 is the numeral for 10) If there is yet another number following this, the third number is added.