FROM THE STUDIO
Notes
What happens to a date, a number, or a line of text between one system and another? These notes explain the choices behind our tools and checks you can make yourself.
Published in English, with sources and a checked date on every article.
Browser-only tools: what stays on your device
A practical way to check where a tool processes your input, what local storage remembers, and when sharing a link changes the privacy picture.
How we check numbers, and a calculation we corrected
A real one-year error in our kanreki calculation explains why definitions, boundary cases, and reverse checks matter more than a reassuring accuracy label.
Why the same text looks different on another screen
Separate the characters you copied from the font, emoji artwork, and app rules that decide how they appear after pasting.
When a date moves between calendars, languages, and forms
A checklist for carrying dates across systems without losing the era, counting convention, school-year boundary, or meaning of a date-only value.