Al-Hasan (may Allah have mercy on him) said that the Prophet (peace and blessings be upon him) used to go out to Eid al-Fitr and Eid al-Adha when the sun had fully risen. This report is mursal, and the practice of the Muslims is also on this, or close to it with a little delay.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة العيدين / 6150
Hadith Gradingمحدثین:ضعيف جداً
Hadith Takhrij«ضعيف جداً۔ أخرجه الشافعي في العم 1/386»