| Akan | Kwabene |
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| Armenian | 12 Arach 1476 |
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| Aztec | Huei Tozoztli 8, 3 Cipactli |
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| Babylonian | 19 Kislimu, 2337 SE |
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| Balinese pawukon | Luang, Pepet, Beteng, Jaya, Keliwon, Was, Anggara of Julungwangi, Guru, Jangur, Pati |
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| Bengali | 14 Poush, BS 1433 |
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| Chinese | Yin Fire Ox・Turtle Beak Mansion 21 Shíyīyuè, Bǐngwǔnián (Dongzhi, 7 days until Xiaohan) |
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| Common Era | 29 December 2026 CE |
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| Coptic | 20 Koiak, AM 1743 |
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| Egyptian | 17 Pachon, 2775 NE |
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| Ethiopian | 20 Tākḫśāś, 2019 Amätä Məhrät |
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| French Republican | Décade I, Octidi de Nivôse de l'Année 235 de la République |
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| Gregorian | 29 December, AD 2026 |
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| Hebrew | 19 Tevet, AM 5787 |
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| Hindu | Pūrvaphalgunī・Ayuṣmān Solar: 14 Pauṣa, 1948 SE Lunisolar: Ṣaṣṭhī, Kṛishna pakṣa of Mārgaśīrṣa, 2083 VE Rāudra・5127 KY・1,872,938 |
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| Icelandic | Þriðjudagur, 7 Mörsugur 2026 |
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| Islamic | 19 Rajab, AH 1448 (using tabular method) |
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| ISO week date | 2026-W53-2 |
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| Japanese | 21 Shimotsuki, Reiwa 8 (Tōji, 7 days until Shōkan) |
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| Julian | 16 December, AD 2026 (AM 7535) |
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| Julian day | 2461404 |
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| Korean | 21 Jwidal, 4359 DE |
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| Maya | 13.0.14.4.1 14 Kankin, 3 Imix |
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| Roman | ante diem XVII Kalendas Ianuarias, MMDCCLXXX AUC |
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| Solar Hijri | 8 Dey, SH 1405 |
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| Tibetan | 21 mgo, me pho rta 2153 or 1772 or 1000 |
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