What is "date of birth and ""eva chen"""?

As an AI language model, I do not have access to real-time information and do not know which Eva Chen is being referred to. However, I can share some general information about the phrase "date of birth."

The date of birth, also commonly known as a person's birthday, is the day and month on which a person is born. It is used to determine a person's age and is often required for official documents and forms.

In many cultures and countries, birthdays are celebrated as a special occasion and may involve traditions such as gift-giving, parties, and special meals. The most common format for writing a date of birth is day/month/year, though the order may vary depending on the for culture or country.

Overall, the date of birth is an important piece of personal information that is used to identify and celebrate individuals on their special day.