The calculators run entirely in your browser. The times and dates you enter for a calculation are never sent anywhere and are not stored by us.
The one exception is the Feedback form: if you choose to send feedback, your message — along with any name or email you optionally include — is sent to us so we can read it and reply. We use that information only to respond to you, and we never sell or share it. If you don't use the Feedback form, nothing you enter leaves your device.
Last updated: June 26, 2026