Back 1000 Abkhazian 1000 Afrikaans 1000 ALS 1000 እ.ኤ.አ. Amharic 1000 AN 1000 Arabic 1000 ARZ 1000 AST 1000 сон AV 1000 Azerbaijani
| Millennium: | 1st millennium |
|---|---|
| Centuries: | 9th century – 10th century – 11th century |
| Decades: | 970s 980s 990s – 1000s – 1010s 1020s 1030s |
| Years: | 997 998 999 – 1000 – 1001 1002 1003 |
| Gregorian calendar | 1000 M |
| Ab urbe condita | 1753 |
| Armenian calendar | 449 ԹՎ ՆԽԹ |
| Assyrian calendar | 5750 |
| Balinese saka calendar | 921–922 |
| Bengali calendar | 407 |
| Berber calendar | 1950 |
| English Regnal year | N/A |
| Buddhist calendar | 1544 |
| Burmese calendar | 362 |
| Byzantine calendar | 6508–6509 |
| Chinese calendar | 己亥年 (Earth Pig) 3696 or 3636 — to — 庚子年 (Metal Rat) 3697 or 3637 |
| Coptic calendar | 716–717 |
| Discordian calendar | 2166 |
| Ethiopian calendar | 992–993 |
| Hebrew calendar | 4760–4761 |
| Hindu calendars | |
| - Vikram Samvat | 1056–1057 |
| - Shaka Samvat | 921–922 |
| - Kali Yuga | 4100–4101 |
| Holocene calendar | 11000 |
| Igbo calendar | 0–1 |
| Iranian calendar | 378–379 |
| Islamic calendar | 390–391 |
| Japanese calendar | Chōhō 2 (長保２年) |
| Javanese calendar | 901–902 |
| Julian calendar | 1000 M |
| Korean calendar | 3333 |
| Minguo calendar | 912 before ROC 民前912年 |
| Nanakshahi calendar | −468 |
| Seleucid era | 1311/1312 AG |
| Thai solar calendar | 1542–1543 |
| Tibetan calendar | 阴土猪年 (female Earth-Pig) 1126 or 745 or −27 — to — 阳金鼠年 (male Iron-Rat) 1127 or 746 or −26 |
1000 (M) was a leap year starting on Monday of the Julian calendar, the 1000th year of the Common Era (CE) and Anno Domini (AD) designations, the 1000th and last year of the 1st millennium, the 100th and last year of the 10th century, and the 1st year of the 1000s decade. As of the start of 1000, the Gregorian calendar was 5 days ahead of the Julian calendar, which was the dominant calendar of the time. In the proleptic Gregorian calendar, it was an exceptional common year starting on Wednesday, and was just like the century common year 1800.
It is one of only seven years to use just one Roman numeral. The seven are 1 AD (I), 5 AD (V), 10 AD (X), 50 AD (L), 100 AD (C), 500 AD (D), and 1000 AD (M).