30-day or 60-day notice of resignation

Questions of practical interest are the ones that tend to get improperly censored on the Law site of Stack Exchange. One of those questions is about employment contracts. The post did not provide the language of the contract, but the scenario can be paraphrased as follows:

My current employment contract requires me to provide a 30-day notice if I decide to resign. This contract will expire in 45 days, but I already signed a one-year renewal that increases to 60 days the requisite notice of resignation.

I need to quit because I just got a better job. Given the overlap of these clauses, does the requirement of 60-day notice already apply?

Some relevant information is missing, which this time precludes an assertive answer. For an assessment of contract issues it is crucial to know the exact terms of the relevant clauses. This time one can only provide some examples of what to watch out for in these contracts.

The renewal agreement might contain a language akin to "This agreement supersedes and replaces any previous or contemporaneous agreements between the parties". This could imply that the clause about 60-day notice is already binding, more so if the renewal amounts to amending the current contract in regard to the time overlap.

Conversely, the terms of the renewal might indicate that the renewal starts taking effect on the date that the new [employment] year begins. This implies that the 30-day notice pursuant to the current contract would be applicable in the meantime.

Other language in either or both contracts would either shed light on the parties' intent or warrant applying the doctrine of contra proferentem. Material implications of how clauses are drafted can go (and often go) unnoticed to parties who don't have enough exposure to contract law.

This post showcases the importance of providing enough details of the contract at issue. Since inquiries of this nature get censored on the aforementioned Q&A platform anyway, people are better off by including those details from the start. In the next post I will address another contract question that also pertains to termination of employment and also got censored on that Q&A platform. That question does include clauses that make it possible to provide a concrete, useful answer.