''' Japanese Era Names and Dates by Ages and Period
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The following is a list of the date of the start of the Japanese eras in chronological order. To find the western equivalent of a year expressed in terms of eras, use: [start date] + [year of period] -1. Thus Keichô 5 (慶長五年) = 1596 +5 -1 =1600.
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Note that not all alternate readings have been indicated.