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1803 (MDCCCIII) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Thursday of the Julian calendar, the 1803rd year of the Common Era (CE) and Anno Domini (AD) designations, the 803rd year of the 2nd millennium, the 3rd year of the 19th century, and the 4th year of the 1800s decade. As of the start of 1803, the…
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| 1803 | - Kali Yuga | 4903–4904 | 1.00 | infobox |
| 1803 | - Shaka Samvat | 1724–1725 | 1.00 | infobox |
| 1803 | - Vikram Samvat | 1859–1860 | 1.00 | infobox |
| 1803 | Ab urbe condita | 2556 | 1.00 | infobox |
| 1803 | Armenian calendar | 1252 ԹՎ ՌՄԾԲ | 1.00 | infobox |
| 1803 | Assyrian calendar | 6553 | 1.00 | infobox |
| 1803 | Balinese saka calendar | 1724–1725 | 1.00 | infobox |
| 1803 | Bengali calendar | 1209–1210 | 1.00 | infobox |
| 1803 | Berber calendar | 2753 | 1.00 | infobox |
| 1803 | British Regnal year | 43 Geo. 3 – 44 Geo. 3 | 1.00 | infobox |
| 1803 | Buddhist calendar | 2347 | 1.00 | infobox |
| 1803 | Burmese calendar | 1165 | 1.00 | infobox |
| 1803 | Byzantine calendar | 7311–7312 | 1.00 | infobox |
| 1803 | Chinese calendar | 壬戌年 (Water Dog) 4500 or 4293 — to — 癸亥年 (Water Pig) 4501 or 4294 | 1.00 | infobox |
| 1803 | Coptic calendar | 1519–1520 | 1.00 | infobox |
| 1803 | Discordian calendar | 2969 | 1.00 | infobox |
| 1803 | Ethiopian calendar | 1795–1796 | 1.00 | infobox |
| 1803 | French Republican calendar | 11–12 XI–XII | 1.00 | infobox |
| 1803 | Gregorian calendar | 1803 MDCCCIII | 1.00 | infobox |
| 1803 | Hebrew calendar | 5563–5564 | 1.00 | infobox |
| 1803 | Holocene calendar | 11803 | 1.00 | infobox |
| 1803 | Igbo calendar | 803–804 | 1.00 | infobox |
| 1803 | Iranian calendar | 1181–1182 | 1.00 | infobox |
| 1803 | Islamic calendar | 1217–1218 | 1.00 | infobox |
| 1803 | Japanese calendar | Kyōwa 2 (享和2年) | 1.00 | infobox |
| 1803 | Javanese calendar | 1729–1730 | 1.00 | infobox |
| 1803 | Julian calendar | Gregorian minus 12 days | 1.00 | infobox |
| 1803 | Korean calendar | 4136 | 1.00 | infobox |
| 1803 | Minguo calendar | 109 before ROC 民前109年 | 1.00 | infobox |
| 1803 | Nanakshahi calendar | 335 | 1.00 | infobox |
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