Gotobi days: the calendar quirk Japanese traders talk about and others miss
Posted: Sat Oct 31, 2026 9:59 am
In Japan, many payments are settled on days of the month that are multiples of five, such as the 5th, 10th, 15th, 20th, 25th and the last day. These are called gotobi days. Importers and other corporates need dollars on those days, and the buying tends to show up in the morning, ahead of the Tokyo fix.
The result, according to many local traders and some published analysis, is a mild upward bias in USDJPY on those mornings, followed by a fade later in the day. It isn't a law and some years it barely works.
If a day lands on a weekend or holiday, the settlement shifts to the previous business day, which moves the pattern.
Anyone interested can test the idea with a spreadsheet. Mark all gotobi days in the last two or three years, take the move in USDJPY from the Asian open to the fix, and compare it with the same measure on other days.
The result will need care. The effect, if present, is small, often a few pips, and it competes with the spread. Sample size matters, and so does choosing the window without hindsight.
Even if it's too small to trade alone, it may help explain why certain mornings behave differently from others.
Has anyone tested the gotobi idea on recent data, and what did it show?
The result, according to many local traders and some published analysis, is a mild upward bias in USDJPY on those mornings, followed by a fade later in the day. It isn't a law and some years it barely works.
If a day lands on a weekend or holiday, the settlement shifts to the previous business day, which moves the pattern.
Anyone interested can test the idea with a spreadsheet. Mark all gotobi days in the last two or three years, take the move in USDJPY from the Asian open to the fix, and compare it with the same measure on other days.
The result will need care. The effect, if present, is small, often a few pips, and it competes with the spread. Sample size matters, and so does choosing the window without hindsight.
Even if it's too small to trade alone, it may help explain why certain mornings behave differently from others.
Has anyone tested the gotobi idea on recent data, and what did it show?