When did Great Britain adopt the Gregorian calendar?

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Kalendarium (“Calendar”) by Regiomontanus — calendar First complete printed title page for the *Kalendarium* (“Calendar”) by Regiomontanus, 1476.

Great Britain and its dominions adopted the Gregorian calendar in 1752.123

At that time, the discrepancy between the Julian calendar—which Britain had previously used—and the Gregorian calendar had grown to 11 days. To align the two systems, the British government enacted legislation that skipped these days: the day following September 2, 1752, was designated as September 14, 1752.24

While the transition was intended to improve international relations and commerce, it caused short-term social and economic friction, particularly regarding the calculation of wages and rental payments. Despite historical myths suggesting widespread public outrage over "lost" days, the legislation was carefully framed to mitigate financial hardship.42