A project timeline is a list of dates that shows when each part of a project should be finished. The easiest way to build one is to start at the due date and work backward. This guide walks through one complete example so you can see every calculation.
Two terms to know
- Milestone: a checkpoint where a specific piece of work is finished, such as “first draft done.” It is something you can clearly say yes or no to.
- Buffer: extra days you deliberately leave empty before a deadline. If something goes wrong, the buffer absorbs it so the final date does not move.
The example project
You need to hand in a written report on Friday, November 20, 2026. Today is Monday, October 26. The work has four parts: research, a first draft, a review by a colleague, and final edits.
Step 1: Estimate each part
Think about how many working days each part needs, here meaning Monday to Friday. Research: 5 working days. Draft: 5 working days. Colleague review: 3 working days. Final edits: 2 working days. You also want a buffer of 2 working days before the due date.
Step 2: Work backward from the due date
Starting at the end, count back in working days, skipping Saturdays and Sundays.
| Part | Working days | Dates | Milestone |
|---|---|---|---|
| Buffer | 2 | Thu Nov 19 – Fri Nov 20 | Submit by end of Fri Nov 20 |
| Final edits | 2 | Tue Nov 17 – Wed Nov 18 | Final version ready Wed Nov 18 |
| Colleague review | 3 | Thu Nov 12 – Mon Nov 16 | Feedback received Mon Nov 16 |
| First draft | 5 | Thu Nov 5 – Wed Nov 11 | Draft sent Wed Nov 11 |
| Research | 5 | Thu Oct 29 – Wed Nov 4 | Notes complete Wed Nov 4 |
Research needs to start by Thursday, October 29. Since today is October 26, you have three working days of slack (Mon Oct 26 to Wed Oct 28) before you even begin. That is good news: the plan fits. If the start date had landed in the past, you would know immediately that something has to shrink.
Calendar days or business days?
Calendar days count every date, weekends included. Business days usually mean Monday to Friday. Use business days for work that only happens on weekdays, like the example above. Use calendar days when waiting happens around the clock, such as “the printer needs 10 days to deliver.” Check holidays separately; neither count removes them automatically. The Veterans Day holiday on Wednesday, November 11, for example, falls in the draft week and may be a day off for you or for people you depend on.
Step 3: Put it on paper
- In the maker, choose Classic Monthly, start month October, 3 months.
- Tap each milestone date and type a short note, such as “Draft sent.” The due date gets its own note.
- Download, print, and hang it where you work.
- Write daily tasks by hand, or print a weekly layout for the busiest weeks.
Step 4: Review against the due date
Once a week, compare where you are with the next milestone. If research finished on Nov 4 as planned, carry on. If it ran two days late, you have two choices: use the buffer, or shorten a later part. Decide right away, and rewrite the affected milestones so the page stays accurate.
Checking dates quickly
To jump forward or back by a set number of calendar days, use the date calculator. It adds or subtracts days, months, or years from a date and shows the weekday. Remember that it counts calendar days, so skip weekends yourself when counting working days.
Add or subtract days from a date
