> The tool outputs the current date and time, so you can double-check that your code won't expire (at :00 seconds) before you get a chance to type it in A lot

> The tool outputs the current date and time, so you can double-check that your code won't expire (at :00 seconds) before you get a chance to type it in A lot of TOTP verifiers often check within ±1 time interval, so you can often just use the first code you see, no need e.g. to wait for it to roll over.