Mazda 323 BG 5 model car, how to learn about the timing belt changing? Car manufactured in year 2000.?

This car has been at a rental car service in Singapoor. When I bought it said only 43000 KMs done. So I have no idea whether someone had altered the digital milege reading.|||alldata.com - $20 subscription gets you access to the repair manual with detailed diagrams.