It's not the same day. Christmas Eve and Christmas are not on the same day.
Christmas is on December 25th every year, while Christmas Eve is the night before Christmas, which is December 24th.
Christmas Eve is the eve of the Christmas celebration and is also a very lively holiday.
Introduction to the Differences Between the Two
Christmas Eve Activities: On the night of Christmas Eve, Westerners, like us rushing home for the New Year's Eve, travel long distances back home to reunite with their families. They celebrate all night, enjoying the lively and harmonious atmosphere of Christmas Eve. They sing Christmas songs by the Christmas tree, exchange gifts, share the joys and sorrows of life in the past year, and express inner blessings and love. The "caroling" activity is also an essential part of Christmas Eve. About nine o'clock in the evening, about twenty young people, along with a few girls dressed as angels and a Santa Claus, go from house to house to sing carols. Finally, after the children fall asleep on Christmas Eve, parents will quietly put Christmas gifts into the stockings.
Christmas Activities: On Christmas Day, all Christian churches around the world hold special worship services. However, with the passage of time, many Christmas celebrations have no connection with religion anymore. For example, exchanging gifts and sending Christmas cards have made Christmas a day of universal celebration. In short, the Western New Year includes two stages: Christmas Eve and Christmas Day.

Christmas Eve:
Christmas Eve is similar to Chinese New Year's Eve. It mainly involves people who are away from home returning to their hometowns, cleaning the house, roasting geese, decorating the Christmas tree, and preparing Christmas gifts, etc. They wait until the evening to have a family reunion dinner. However, in the passionate Alpine region, there are a group of romantic poets who love life and music. Most of them believe in Christianity. Every Christmas Eve, they take out their instruments, gather around the fireplace to sing songs, all of which are joyful and celebratory. They sing spontaneously and forget it once they finish.
Christmas:
Christmas (Christmas) is also known as the Birthday of Jesus Christ or the Feast of the Nativity. The Catholic Church also calls it the Feast of the Nativity of Jesus Christ. Its name translates to "Christ Mass," which originated from the Roman festival of Saturnalia, which was originally unrelated to Christianity. After Christianity became popular in the Roman Empire, the church incorporated this folk festival into the Christian system, celebrating the birth of Jesus. However, on Christmas Day, it is not actually the birthday of Jesus, because the Bible does not record the exact date of Jesus' birth. Likewise, there is no mention of such a festival. It is the result of Christianity absorbing ancient Roman mythology.