Is there something wrong if I urinate often in the daytime? Is this symptom of diabetes? Thx.

May be. Urinating a lot can be a symptom of diabetes but there area ny other possible causes, and a history, physical, and simple blood/urine test by your pcp can sort it all out for you.
Could be. That is one of the signs of diabetes. There are other things can cause it so you need to have a blood test to determine if you have diabetes.