Activity Timestamp & Timezone Shifter - Shift Workout Dates & Resync Clocks
Forgot to update time zone while traveling or getting "Duplicate of existing activity" errors on Strava? Shift time by seconds, hours, or days.
How to Use Time & Timezone Shifter in 3 Simple Steps
Step 1: Upload
Drag & drop your .FIT, .GPX, or .TCX activity file. All processing is 100% private in your browser.
Step 2: Process
FitCrop inspects telemetry streams, removes anomalies, recalibrates metrics, or fixes binary checksums.
Step 3: Export
Download your clean Strava, Garmin, and Zwift compatible file with 1 click. Zero server wait.
Frequently Asked Questions
How do I fix Strava error: "Duplicate of an existing activity"?
Strava blocks uploads that have the exact same starting timestamp as a previous workout. Use FitCrop's +5 Seconds quick preset to shift the start time slightly, allowing Strava to accept it immediately.
Can I fix activities recorded in the wrong timezone after traveling?
Yes. FitCrop lets you offset timestamps by ±1 to ±24 hours across every point in your activity.