| 13 March: | The thirty days of Ramadan in the Islamic year 806 begin at the first sighting of the lunar crescent. | |
| 30 March: | The resurrection of Jesus Christ is celebrated on Easter Sunday following the first full moon following the spring equinox since the Council of Nicaea in 325. | |
| 4 April: | Jews celebrate Pesach for the next seven or eight days. | |
| 12 April: | Muslims celebrate the Conclusion of the Fast on the first day of the month Shawwal. | |
| 18 May: | Seven weeks after Easter Christians celebrate Pentecost, possibly since 68 AD. | |
| 14 June: | Welsh rebel leader Owain Glyndŵr signs an alliance with the French against the English. | |
| 19 June: | Muslims celebrate the Festival of Sacrifice on the tenth day of the month Dhu al-Hijjah. | |
| 24 September: | Jews celebrate Yom Kippur since sunset last night. |
Henry IV, Jan Hus, John the Fearless, Ibn Khaldun, Timur, Yongle, Wenceslas IV, Henry V, Cosimo de' Medici, Henry the Navigator, Philip the Good and Nezahualcoyotl celebrated their birthday this year.
The year 1404 was a leap year starting on a Tuesday, just like 1320, 1348 and 1376 in the century before it and 1432, 1460 and 1488 in the next.
The coloured days highlight
births
,
deaths
,
political
,
scientific
,
artistic
and
other
historical milestones, and recurring events such as anniversaries and
holidays
.
The new
,
waxing
,
full
and
waning
icons indicate the phases of the moon and appear only for dates in the Gregorian calendar, i.e. after 14 October 1582. The Chinese calendar is available only from 1645 to 2644, the first millenium since the last reform. The coloured columns mark the Sundays, the last day of the week per standard ISO-8601.
The normal calendar page for the current /year?2013 contains an introduction to the intriguing history of the year as we know it. The Calendar Converter has more detail. The so called Perpetual Calendar uses a trick from before the age of computers to find the weekday for any Gregorian date. Also see an overview of all historical events in the last six thousand years.