the IRS guide simply states 'at least 24 months"
https://www.irs.gov/pub/irs-pdf/p523.pdf
right side of page 3
Eligibility Step 2—Ownership
Determine whether you meet the ownership requirement. If you owned the home for at least 24 months (2
years) out of the last 5 years leading up to the date of sale (date of the closing), you meet the ownership requirement.
personally, if it were me, and it didn't upset the deal, I'd push it to July 1st to be safe.
