1926 in the Japanese calendar: Taishō 15 and Shōwa 1
昭和元年
Taishō 15 until 25 December 1926, then Shōwa 1 · written T15 or S1 on forms
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1926 belongs to two eras
Until 25 December 1926 it was 大正15年 (Taishō 15). From 25 December 1926 it became 昭和元年 (Shōwa 1). A document dated in this year must use the era that was current on that day — and the first year of a new era is written 元年, gannen, never 1年.
Shōwa 1 lasted exactly seven days, from 25 to 31 December 1926.
Other years
Every year of the Shōwa era → · How the Japanese calendar works, and every year 1868–2050