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It was 39 weeks.
The period is seventeen weeks and four days inclusive.
Jan 1st - Oct 31st is Forty weeks and two days - according to my Windows calendar !
1227 weeks.
21 weeks and 4 days.
21 weeks and 4 days.
From the 7th of September to the 1st of October is 3 weeks and 3 days.
34 weeks and 5 days.
34 weeks and 5 days.
52 weeks.
From January 1st 2020 to June 1st 2010 is 500 weeks and 1 day. From January 1st 2020 to June 1st 2020, which may be what you meant to ask, is 21 weeks and 5 days.
Between January 1st 2010 and May 1st 2010 there are 121 days. There are 12.7 weeks between January and May of 2010.