Thank you for submitting your question!
You can just calculate the number of days between these two dates on the calendar … so March 5 to May 5 should have a total of 61 days.
March has 31 days, so March 5 to March 31 is 26 days.
April has 30 days
May 1 to May 5 is 5 days.
Putting that all together would be 26 + 30 + 5 = 61 days :)