Project timelines, payment terms and delivery deadlines are usually measured in working days, not calendar days. A 10-day sprint that starts Monday doesn't end the following Thursday — it ends two weeks later on Friday. Counting working days correctly avoids missed deadlines.
The Manual Method
Step 1: Count total calendar days between the dates. Step 2: Count the number of complete weeks — multiply by 2 to get weekend days. Step 3: Check whether the remaining partial week includes a Saturday or Sunday. Step 4: Subtract weekend days from total. Step 5: Subtract public holidays that fall within the period.
Example: 1 September to 30 September 2026.
- Total days: 29 (September has 30 days; 30 − 1 = 29 days from Sep 1 to Sep 30).
- Complete weeks: 4 (4 × 2 = 8 weekend days).
- September 1 is a Tuesday in 2026; Sep 26–27 is the partial-week weekend.
- Weekend days: 8 + 2 = 10.
- Working days (before holidays): 29 − 10 = 19 working days.
In practice, working this out manually is error-prone — the Working Days Calculator handles it instantly.
Pakistan Public Holidays in Context
Public holidays in Pakistan vary by province and can change annually. Major national holidays include Pakistan Day (23 March), Labour Day (1 May), Independence Day (14 August), Defence Day (6 September), and Eid and other Islamic observances whose dates shift each year with the lunar calendar.
For contracts or project plans spanning Eid periods, always confirm the exact holiday dates with the government calendar for the current year rather than assuming.
Common Uses
| Use case | Why working days matter |
|---|---|
| Invoice payment terms (net-15 business days) | Due date falls on a working day |
| Project delivery | Milestones need to fall on working days |
| Employment notice periods | Some contracts specify working days |
| Court or legal filing deadlines | Often in business days |
| Bank processing times | Banks don't process on weekends or holidays |
Converting Between Calendar and Working Days
A rough rule of thumb: 5 working days ≈ 7 calendar days (one week). For longer periods: multiply working days by 7/5 (1.4) to estimate calendar days, or divide calendar days by 1.4 to estimate working days.
For counting all calendar days between dates (not just working days), see how to count days between two dates.
Working Days in Legal and Contract Contexts
When a contract says "within 14 working days," it typically means 14 business days, excluding weekends and public holidays. For any dispute about whether a deadline was met, the count starts the day after the triggering event (day 0), not on the day itself. So "14 working days from invoice date" with an invoice dated 1 September means day 14 falls around 22 September (accounting for weekends and any public holidays). Working Days Calculator gives an exact count for any range.
