Check if timestamp affected by leap second. 100% client-side.
Leap Second Checker: Check if timestamp affected by leap second. Run it before deploying configs, sending payloads to an API, or committing to version control. The tool ships as static JavaScript. After loading, all operations are offline and private. Available in HttpStatus.com's Timestamp toolkit.
Leap Second Checker validates syntax and format rules. For schema-level checks, use a dedicated schema validator.
Leap Second Checker checks format syntax. Your app may enforce additional rules like required fields or value constraints.
No installation, works on any device, and results are shareable via URL. CLI tools are still better for CI/CD pipelines.
No — client-side tools don't transmit your input. Standard page-view analytics may run, but your data is never included.