When is the first bus for chidambaram from Koyambedu

I need to go to chidambaram annamalai university bus is my only option. I checked tnstc website they are showing first bus leaves at 2.30 from Koyambedu I think it's not right i remember seeing buses to chidambaram in mornings. Did they reduced all buses or the website doesn't show the correct data. Also i checked buses from kilambakkam their too first bus leaves after 12pm.