No. It can be any date but is usually the anniversary date of the death of the saint.
The feast day of the saint is the same as the saint's day. For example, the Feast of St. Patrick is also known as St. Patrick's Day - March 17.
No. Canonization is the church's formal process of declaring that an individual is a saint. This use of the word saint (common in the Roman Catholic Church but not in every Christian church) means that it is certain that the individual is now in heaven. Feast day refers to the day chosen by the church for that individual to be honored in a special way by the faithful.
All saints and blesseds are assigned a feast day by the Vatican's Sacred Congregation for the Causes of Saints.
Not all saints have a designated feast day. In the Catholic Church, recognized saints typically have a feast day to commemorate their lives and contributions, but some lesser-known saints may not have one. Additionally, certain local or regional saints may have feast days that are not universally observed. Overall, while many saints are celebrated with feast days, it varies depending on recognition and tradition.
The feast of Saints Peter and Paul - June 29.
The feast of All Saints is celebrated on November 1st. It is a day for Christians to honor and remember all the saints in heaven, both known and unknown.
Everyday there are dozens of saints that are memorialized. However, if that feast falls on a Sunday or another important feast day, or Good Friday, the saint's day is not observed.
No. There are thousands of saints, so it would be impossible for every single one of them to have their own feast day (unless we decided to devote each day of the calendar to several different saints). Instead, only those saints who had the greatest impact on the Church or around whom a fervent devotion has grown are celebrated with feast days in the liturgical calendar.
Originally, the feast date of Thomas Aquinas was on March 7, the day he entered heaven. It is unknown to me the reason for the change. You need to know that there are thousands and thousands of saints and each one has a specific feast day. That means that, on any given day, there may be dozens of saints who are celebrated that same day.
June 29 - the feast of Saints Peter and Paul
Nearly all the recognized saints have a designated feast day each year. However, there are thousands and thousands of saints in Heaven whose names are known only to God who do not have a feast day. All Saints Day recognizes all the unnamed saints.
November 1 is the feast of All Saints.