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Taiwan ROC and Gregorian date converter

Convert Taiwan ROC years and Gregorian years in either direction, with optional month and day.

Start with your own numbers

Editable example

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Choose the input calendar and enter the year. For a complete date enter both month and day.

Choose the notation used by the date you already have.
ROC year 1 starts in 1912; Gregorian years before 1912 are outside this tool.
Leave month and day both blank for a year-only conversion.
When entering a date, enter both month and day and check the actual calendar date.

Results update when inputs are complete. A plan is kept only when you save it. Inputs and results are not uploaded.

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Example result

Gregorian year

2026

The result is the same Gregorian calendar date in the other year notation, not a lunar conversion or age.

Worked steps

  1. 115 + 1911 = 2026

ROC year 1 is Gregorian 1912. Add 1911 to an ROC year or subtract 1911 from a Gregorian year. The month and day remain unchanged; this is not a lunar conversion. For a year alone leave month and day both blank; otherwise enter a valid date including leap-year rules. Only ROC year 1 to Gregorian 9999 is supported; pre-ROC years, ages, zodiac signs and lunar dates are not included.

Method and scope

ROC year 1 is Gregorian 1912; add 1911 to an ROC year or subtract 1911 from a Gregorian year. Month and day stay the same.

Only ROC year 1 onward through Gregorian 9999 is supported. This does not convert lunar dates, pre-ROC years, ages or zodiac signs.

References:www.ca.ntpc.gov.tw reference、www.president.gov.tw reference

Purpose

Convert a Taiwan ROC calendar year or complete date to Gregorian notation and back.

What to enter

Choose the input calendar and enter the year. Leave month and day blank together for a year-only conversion.

Method

ROC year 1 is 1912; add or subtract 1911 while keeping the same month and day.

Example

ROC 113 February 29 is Gregorian 2024 February 29; both names describe the same valid leap day.

Reading the result

The year is shown in the other notation; if supplied, month and day appear separately.

Limits

Pre-ROC years and lunar calendar conversions are not supported. The tool rejects nonexistent dates rather than silently rolling them forward.

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