Easter and its related holidays are moveable feasts, not falling on a fixed date; its date is computed based on a lunisolar calendar (solar year plus Moon phase) similar to the Hebrew calendar.
International Tea Day is observed annually on May 21, according to the United Nations.
Easter and the holidays that are related to it are moveable feasts, in that they do not fall on a fixed date in the Gregorian or Julian calendars (both of which follow the cycle of the sun and the seasons)
As Easter always falls on a Sunday, many countries in the world also recognize Easter Monday as a public holiday.
