"たいし%E.\" does not look like a number or match any era. You can input a number, like 1959, an era in romanized form, like Showa 34, or an era in kanji, like 昭和34.
Convert a Japanese era date like Showa 14 into a Western year, or convert a Western year like 1964 into a Japanese era year.
See also the FAQ page on Japanese years and the FAQ complete list of Japanese eras.