Time remaining Feature Request

[Andr01dx86]

This program is great!!! I use it to pass codes to a program I use.

Would it be possible to check how much time is left? Something like:

2fa github -time
9 (seconds left)

This way people could use this command to determine if the one time code should be pulled or wait to pull another.

[dmitshur]

PR #11 is relevant.

[rsc]

https://datatracker.ietf.org/doc/html/rfc6238#section-5.2, which suggests allowing one-time-unit old TOTPs to validate, to account for time skew and network delays. Do you know of any TOTP-consuming auth systems that don't follow this advice? I've literally never had a problem with this, but maybe I am using different systems.