Photo by Zheng XUE on Unsplash
Pick up a convenience store receipt in Japan and you might see a date like “令和7年11月10日” instead of 2025. Pull out a rental car form, a pension card, or a shrine’s wooden ema plaque, and the same odd numbering shows up again. This is Japan’s imperial era system, or gengo, and it’s still very much alive — not a historical curiosity reserved for museum placards. If you’re filling out a residence card application, renting a bicycle, or trying to read the expiration date on a museum ticket, knowing how gengo works will save you real confusion.
What Reiwa actually is
Japan counts years in two parallel systems: the Western (Seireki) calendar most visitors know, and the era calendar (gengo), which restarts at 1 every time a new emperor ascends the throne. The current era is Reiwa (令和), which began on May 1, 2019, when Emperor Naruhito took the throne the day after his father, Emperor Akihito, abdicated. That makes 2019 “Reiwa 1” (written 令和元年, using 元年 rather than 1年 for the first year of an era), 2020 “Reiwa 2,” and so on. Doing the math is simple once you know the anchor point: subtract 2018 from the Western year to get the Reiwa year, or add 2018 to the Reiwa year to get the Western one. So Reiwa 7 is 2025, and Reiwa 8 (starting January 2026) will be 2026.
Before Reiwa came Heisei (1989–2019, Emperor Akihito), and before that Showa (1926–1989, Emperor Hirohito), which is why you’ll still occasionally see Showa dates on older buildings, manhole covers, or secondhand goods — a Showa 50 stamp means 1975.
Where you’ll actually encounter it as a tourist
Gengo isn’t confined to government paperwork. Expect to see it on:
- Receipts and invoices — many retailers and restaurants print the date in era format, sometimes abbreviated to just “R7.11.10.”
- Residence cards, driver’s licenses, and health insurance cards — birthdates and expiration dates are frequently rendered in gengo.
- Train and bus IC card balance printouts
- Shrine and temple items — ema (wooden wish plaques), omamori charms, and goshuin stamp-book entries are often dated by era, especially around New Year’s visits.
- Official forms — tax documents, rental contracts, and immigration paperwork almost always default to gengo, sometimes with a small Western-year field alongside.
- Coins — Japanese yen coins stamp the mint year in gengo on the reverse, so a ¥100 coin might read 令和6年 instead of 2024.
If you’re mailing postcards home and want to date them the way a local would, a washi letter set from your ryokan is a nice touch — just know whether you’re writing Reiwa or Western years if you add a date.
Quick conversion reference
You don’t need to memorize anything complicated — just this one offset:
- Reiwa year + 2018 = Western year (e.g., Reiwa 6 + 2018 = 2024)
- Western year − 2018 = Reiwa year (e.g., 2025 − 2018 = Reiwa 7)
- Heisei year + 1988 = Western year (Heisei ran 1989–2019)
- Showa year + 1925 = Western year (Showa ran 1926–1989)
A useful trick for the current era specifically: since Reiwa 1 = 2019, just remember that Reiwa 7 = 2025, and adjust from there. If a form only gives you a blank gengo field and a kanji checkbox for 令和/平成/昭和, tick 令和 (Reiwa) for anything dated since May 2019.
Common mistakes visitors make
The most frequent error is assuming a two-digit gengo year is the same as the last two digits of the Western year — it isn’t, because the eras don’t align with round decades. Reiwa 7 is 2025, not 2007 or 2017. Another common slip-up: on forms asking for your birth year, many Japanese bureaucratic forms genuinely expect gengo even for foreigners, but almost all official immigration and bank forms accept Western format if you write “西暦” (seireki, meaning “Western calendar”) next to the number, or simply write it as 1990 instead of converting to a foreign era system that doesn’t apply to you anyway — your birth year should always stay in the Western calendar unless a Japanese clerk specifically asks for conversion. Also, don’t assume every form is era-dated; modern digital kiosks, airport immigration terminals, and most English-language tourist materials use Western years exclusively.
Why the system hasn’t been phased out
Gengo isn’t a leftover from pre-war Japan — it’s written into law. The 1979 Era Name Act formalized the practice of each emperor’s reign getting a new name, and government agencies, banks, and the family registry (koseki) system are built around it. When Reiwa began in 2019, companies spent months (and yen) updating software, forms, and vending machines that hard-coded Heisei-era date fields — a scramble that made international news at the time. Because so much legacy infrastructure, from bank passbooks to pension records, runs on gengo, switching entirely to Western dates would mean rewriting decades of paper and digital records. For visitors, the practical upshot is that era dates are a permanent fixture of daily paperwork, not a fading tradition.
Timing your trip around era-related events
There’s no single “Reiwa festival,” but era transitions and anniversaries do affect travel. The start of a new era is typically marked with a public holiday (May 1, 2019, when Reiwa began, was a one-off national holiday), and the Emperor’s Birthday (February 23) is a fixed annual holiday worth knowing about if you’re visiting Tokyo — the Imperial Palace grounds open to the public for rare general entry on that date. Beyond that, era dating shows up most visibly during New Year (early January), when shrines sell goshuin and omamori freshly dated for the new year, and millions of visitors pick up era-dated keepsakes as part of hatsumode, the first shrine visit of the year.
Practical tips for your trip
- Keep a mental note: Reiwa + 2018 = Western year. Write it on a phone note if you’re prone to forgetting.
- When filling out Japanese-language forms at a city hall or post office, ask staff “Seireki de ii desu ka?” (“Is Western calendar okay?”) — most clerks will accept it.
- If you’re collecting dated souvenirs like goshuin stamps or sake labels, snap a photo of a conversion chart (widely available via a quick search) so you can decode purchase dates later.
- Secondhand and antique shops often list Showa-era manufacture dates — handy to know if you’re browsing vintage cameras or film gear, since a Showa 60 stamp means 1985. If you’re shooting film during your trip, our guide to getting rolls developed fast and buying more film mid-trip covers where to restock.
Gengo can feel like an extra layer of mental math on top of jet lag, but it’s one of those small systems that, once decoded, makes Japan’s paperwork — and its sense of time — a little more legible. Next time a receipt reads “R7,” you’ll know exactly what year you’re actually in.