common era
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この出来事は西暦一九四五年に起こった。
This event happened in 1945 AD.
書類には西暦で生年月日を書いてください。
Please write your date of birth in the Gregorian calendar on the form.
日本では和暦と西暦の両方が使われる。
In Japan, both the Japanese era calendar and the Gregorian calendar are used.