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Days between dates
Common spans
| Span | Calendar days | Weeks |
|---|---|---|
| 2026-01-01 → 2026-12-31 | 364 | 52.0 |
| 2026-07-01 → 2026-12-25 | 177 | 25.3 |
| 2026-07-01 → 2027-01-01 | 184 | 26.3 |
| 2026-01-01 → 2027-01-01 | 365 | 52.1 |
| 2026-07-01 → 2026-08-01 | 31 | 4.4 |
Calendar days vs. weekdays
Calendar days count every day; weekdays exclude Saturdays and Sundays (federal holidays, 11 per year in the US, are not deducted here). The count excludes the start date and includes the end date, the usual convention for deadlines. Months vary from 28 to 31 days, so "1 month" ≠"30 days": a net 30 invoice and a monthly contract renew on different dates.
Last updated: · Methodology and sources