What Is 45 Calendar Days From Today?
45 calendar days from today is —. "Calendar days" means every day of the week — weekends and public holidays are all counted. This distinction matters when contracts, statutes, or deadlines specifically say "calendar days" instead of "business days".
Forty-five calendar days is one of the most important deadlines in US real estate — the IRS 1031 exchange identification window is 45 calendar days, hard.
Calendar Days vs. Business Days
This is the difference that trips people up most. Calendar days count every single day — Monday through Sunday, plus holidays. Business days only count Monday through Friday, skipping weekends (and sometimes federal holidays, depending on context).
Specific uses: Forty-five calendar days is the critical 1031 exchange identification window in US real estate (no extensions, ever). It's also the standard window for IRS Offer in Compromise initial response, and the typical timeline for SEC Form 13F institutional holdings disclosures after each quarter-end.
When To Use Calendar Days
Calendar-day counts are the default in most US legal and commercial contexts. You'll see them explicitly required in:
- Tax filings and IRS extension windows
- Real estate closing deadlines (including 1031 exchanges)
- Federal and state statutes of limitations
- Product return and warranty policies
- Insurance claim filing windows
For 1031 like-kind exchanges: the 45-day identification window starts the day after the relinquished property closes. It does not extend for weekends or holidays. If day 45 falls on a Sunday, you still need the identification letter postmarked by end-of-day Sunday — which in practice means getting it out Friday.
Related Pages
Same number of days, alternate phrasings and calculations.