Japanese to Western Date Converter

Convert Japanese era dates (年号) to Western calendar dates. Enter the era name and year to get the corresponding Western date.

Japanese Era (年号)

Year (年)

Month (月) - Optional

Day (日) - Optional

Quick examples:

Conversion Formula

To convert Japanese era years to Western years:

Western Year = Era Start Year + Japanese Year - 1

Examples:

令和5年 = 2019 + 5 - 1 = 2023
平成10年 = 1989 + 10 - 1 = 1998
昭和60年 = 1926 + 60 - 1 = 1985

Important Notes

Era transitions happen on specific dates, not January 1st
The first year of an era may be partial (e.g., Reiwa 1 started May 1, 2019)
When converting dates near era transitions, verify the exact transition date
Some documents use both era and Western years (e.g., 令和5年（2023年）)

Tip: For dates before 1868 (Meiji era), traditional Japanese calendar systems were more complex with frequent era changes. This converter focuses on the modern era system.