How to Adjust the Start Time of Your Activity

By Roy Lachica on July 04, 2026. Last updated July 4, 2026.

Ever finished a run or ride and realized you started your GPS watch at the wrong time? Or maybe you've traveled to a different time zone and your device didn't update, leaving your activity with an incorrect timesta GpxFix's Adjust Start Time feature is here to solve that problem.

What is Adjusting the Start Time?

The Adjust Start Time (or Time Shift) feature allows you to modify the timestamps of all the data points in your GPX file. You can shift the entire activity forward or backward in time without affecting the duration, distance, or shape of your route. This is purely a metadata correction.

Why Is This Useful?

Correcting the start time of your activity is important for several reasons:

Accurate Records: Ensures your training log accurately reflects when you actually performed the activity. This is crucial for tracking your progress and understanding your performance patterns over time.
Time Zone Correction: Easily fix activities recorded in the wrong time zone. If you've traveled and your device didn't sync, your workout might appear at an odd hour. A quick time shift can place it correctly in your activity feed.
Privacy and Security: If you share your activities publicly, the start time can reveal patterns about your daily routine, such as when you leave for a run or when your home is empty. By shifting the start time by a random or fixed amount, you can obscure your exact schedule, adding a valuable layer of privacy and security.
Aligning with Other Data: If you're combining GPS data with photos or videos, ensuring the timestamps are aligned is essential for creating accurate and synchronized stories of your adventures.

Common Scenarios for Adjusting Start Time

Forgetting to start your watch at the beginning of a race and starting it a few minutes late.
Your GPS device's clock being off.
Traveling across time zones without your device updating.
Wanting to align the start time with an official event start time.

How to Use the Adjust Start Time Feature

After uploading your GPX file to GpxFix, you'll find the 'Adjust time' option in the toolbox. From there, you can:

Select a new start date and time for your activity.
Alternatively, you can specify a time duration to shift the entire activity forward or backward (e.g., add 10 minutes, or subtract 2 hours).

Once you apply the change, GpxFix will recalculate all the timestamps in your file. You can then download the corrected GPX file and upload it to your favorite fitness platform.

Ready to Fix Your Timestamps?

Upload your GPX file and use the 'Adjust time' tool to ensure your activities are perfectly time-stamped.