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I worked this out by finding February first because it is the only month with 28 days. Then I figured out that when February started, 1 day before would be the end of January. Then I looked at the end of February and found a calendar with a starting point of the day after February finished. Then I looked at the end of March and looked at the end to find the last day to get the next month. I then looked at the end of April to find the last day, one day after would be the start of the next month. Then I found the end of may and added one day to find June’s starting point. For July I looked at the end of June and added one day. I did the same for the rest of the months. I also wrote out how many days there is in each month and used that to help me and make sure I had the right calendar in the right place.