Don’t understand Schengen visa

Good evening, I am very confused about the Schengen zone 90/180 day visa rules. I am a Canadian citizen. I am going to give an accurate example of days that I am in Sweden, and days in the future that I would like to travel and be in Sweden. I arrived in Schengen area on January 1st 2025, and am leaving Schengen area to come back to Canada on February 21st 2025. I would like to come back to Schengen area on June 30th 2025, and leave Schengen area on September 7th, 2025. Would those specific dates work under the 90 day period of 180 days? Why or why not ? I have already used the Schengen visa calculator, and it does not make sense. Please get back to me as soon as possible. Thank you