Training Plan Start Date Calculator
Work backwards from race day to place an existing training plan on your calendar. Choose the first weekday, plan length and full-date buffer.
Starts with an editable example. Replace the dates and rules with your own.
Your calculation
Ready when you are
Choose your dates.
Select your counting rules and calculate.
Calculation details
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How to use this calculator
Enter race day, the number of weeks in your plan, your week-start day and full dates to leave between training and the event.
The final training date precedes the buffer and race. Its week begins on your chosen weekday; earlier weeks count back from there. The final week can be shorter than seven dates.
A worked example
A twelve-week plan for Sunday May 16, 2027, beginning weeks on Monday with no extra buffer, starts February 22 and ends May 15.
Will the tool create a training program?
No. It maps a plan you already have onto dates. It does not prescribe workouts, taper length or suitable training volume.
Which calendar and years are supported?
Use Gregorian dates from 1900 through 2100, with results in that range. Daily plans allow up to 366 dates; dark-sky searches allow 31 nights. Durations, capacities and policy rules are supplied by you. Astronomy uses the bundled Astronomy Engine, sea-level geometry and browser time-zone rules. Timed exports use UTC instants; date-only events do not assign a clock time. Copy, CSV and print include calculation assumptions. Nothing is booked or scheduled outside this page.
What happens to my dates?
Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.