I have bought the bike.
I bought the bike last year.
I have had the bike for a year. / I have had the bike since a year ago. It is a year since I bought the bike.It has been a year since I bought the bike.
I have bought the bike.
I bought the bike last year.
I have had the bike for a year. / I have had the bike since a year ago. It is a year since I bought the bike.It has been a year since I bought the bike.