When you setup timer for 17 days from now, the alarm will ring after 1468800 seconds
If you have set timer for 17 days from now, you can be 100% sure that alarm will ring after 17 days. You can trust us completely.
The timer will still ring after 17 days, even if you refresh the browser, since we store the information in browser's local cache.
It will be gone. The timer will not ring after 17 days, if you close the tab.
It will be gone. The timer will not ring after 17 days, if you close the browser.