How to normalize Japanese 和暦 (era) dates for invoice systems
令和・平成・昭和 to ISO 8601 — era tables, 元年 handling, Reiwa edge cases, and the pitfalls that break naive conversion.
Read the note
Insights
Engineering notes on AI for the Japanese market.
Deep, practical write-ups on the problems most English-language sources skip — Japanese dates, invoice extraction, and production document intelligence. Written by the people who build it.
Extracting structured data from Japanese invoices with LLMs
A field taxonomy for 請求書, why layout varies, confidence thresholds and human-in-the-loop routing, and using the consumption tax as a correctness check.
Read the noteMore notes are published regularly. Want the pipeline behind these on your own documents? Book a 15-minute introduction.