I'm not sure exactly. You might have to check the specific comic strip or related sources for that information.
Well, it's hard to say for sure. It could be mentioned in a particular issue or maybe it's never been explicitly stated. You might need to do some digging through the comic archives to find out.
I don't know the exact date. Sometimes the birthday of a character like Cathy in a comic strip isn't made clear. Maybe you could try reaching out to the creator or other fans to see if they know.
Chapter 715, "Childhood Shadow", is the clearest early answer because it turns Once Xiao Shixu's situation into a concrete plot event.
Chapter 732, "Sister Xiao Wan, I Don't Understand", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter gives readers a real answer by opening on Bai Lu, eavesdropping in the corner, marveled at Jiang Cheng's...
Chapter 757, "Don't come begging us then!", is the clearest early answer because it turns Grandpa Cheng's situation into a concrete plot event. It opens with Old Man Cheng's guess was spot-on. and closes on The car was unassuming, but the license plate was anything but..
Chapter 558, "The Love-Struck, Flirty Wife Appears", is the clearest early answer because it turns Ai Xiaochun's situation into a concrete plot event. A useful checkpoint is the way the scene starts with These people's comments are just too unpleasant; where does the fish...
Chapter 8 is the strongest chapter-level answer because it starts from The resentment that had barely calmed among the crowd surged back two... and follows through on Other people with a handsome and charming appearance often try to conceal....
Chapter 706, "How Did a Good Person Turn Out Like This?", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event.
Chapter 789, "Son Toad", is the clearest early answer because it turns Gu Yu's situation into a concrete plot event. The chapter gives readers a real answer by opening on Shang Shaojing had given her an envelope containing a piece of paper...
Chapter 904, "Welcome Young Master and Young Madam!", is the clearest early answer because it turns Yu Fei's situation into a concrete plot event. Early on, Jiang Bufan and Jiang Buchen immediately ran up in surprise..
Chapter 666, "It Really is His Mom!", is the clearest early answer because it turns Tai Fan's situation into a concrete plot event. The chapter turns that into something concrete by moving from The crowd was shocked as they turned their attention to the unknown,...
Chapter 756, "Birthday Banquet", is the clearest early answer because it turns Sister's situation into a concrete plot event. The chapter gives readers a real answer by opening on On the day of the birthday celebration, the Jiang Family got up early.