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Coin Date Converter

Convert dates between Gregorian and various calendar systems used on world coins

Important for Coin Collectors

Many countries use different calendar systems on their coins. This converter helps you identify the actual Gregorian year. Note: Some conversions are approximate due to varying new year dates.

Gregorian Date

Japanese

Reiwa 8
Native Script Result
令和 八
Common Era: 2026

Conversion Result

Reiwa 8.09.15
Common Era: 2026

Japanese

Uses era names: Reiwa (2019-), Heisei (1989-2019), Showa (1926-1989), Taisho (1912-1926), Meiji (1868-1912)

Muslim (Hijri)

Islamic lunar calendar (AH - Anno Hegirae). Used in many Middle Eastern countries.

Thai (Buddhist)

Buddhist Era calendar. Add 543 to Gregorian year. Thailand uses this system.

Hebrew

Hebrew calendar (AM - Anno Mundi). Used on Israeli coins and ancient Judaean coins.

Iranian (Solar)

Solar Hijri calendar (SH). Iran and Afghanistan use this system. New year is March 21.

Taiwanese (ROC)

Republic of China (ROC) or Minguo calendar. Subtract 1911 from Gregorian year. Used in Taiwan.

Nepali (Bikram)

Bikram Sambat calendar. Add 57 to Gregorian year. Used in Nepal.

Burmese

Myanmar Era calendar. Subtract 638 from Gregorian year. Used in Myanmar (Burma).

Bengali

Bangla San calendar. Subtract 593 from Gregorian year. Used in Bangladesh and West Bengal.

Roman

Ab Urbe Condita (AUC) - from founding of Rome. Add 753 to Gregorian year. Ancient Roman coins.

Calendar Reference for Collectors

Understanding calendar systems is essential for identifying and dating world coins. Here's what you need to know about each system:

  • Japanese: Japan switched to Gregorian in 1873 but continued using era names. Era changes with each emperor.
  • Muslim (Hijri): Many Islamic countries show both Hijri and Gregorian dates. Hijri year is shorter, so years count faster.
  • Thai (Buddhist): Thailand (Siam) adopted this system. The year is always 543 years ahead of Gregorian.
  • Hebrew: Israel uses both Hebrew and Gregorian. Ancient Jewish coins from before 70 CE used regnal years.
  • Iranian (Solar): Iran switched to Solar Hijri in 1925. Afghanistan uses similar system. Both write dates right-to-left.
  • Taiwanese (ROC): Taiwan uses ROC calendar starting from 1912 (founding of Republic). Some coins show both ROC and AD.
  • Nepali (Bikram): Nepal uses Bikram Sambat which is about 57 years ahead. Each month has different number of days.
  • Burmese: Myanmar uses Myanmar Era starting from 638 CE. Some coins show both ME and Gregorian dates.
  • Bengali: Bangladesh uses Bangla San calendar. New Year (Pohela Boishakh) is April 14.
  • Roman: Ancient Roman Republican and Imperial coins rarely show dates. AUC was calculated retrospectively.