Saturday, July 15: this is my sister's birthday. This year she is 5 years old and over. I would like to buy a birthday gift to her, but I choose not to buy what was given to her.
Saturday, July 15 to this was the birthday of my sister. This year, she reached the age of five years old, I wanted to buy a birthday gift to her. But I choose not to buy anything for her.
Saturday 15 July to this is the birthday of my sister this year she was fully 5 years old. I wanted to buy a birthday gift for you. But I can't decide what to buy for you.