Congratulations on your marriage! It's understandable to have concerns about the legal implications of your filing process. Here's a detailed analysis of your situation:

When you and your partner got married, your marriage is considered valid based on the ceremony and mutual consent, regardless of when the marriage was officially registered with the Municipality. However, the process of registering your marriage is crucial for legal recognition in many jurisdictions.

By changing the wedding date on your application form to December, there are a few potential legal implications to consider:

• Intentional Misrepresentation: Filing a document with incorrect information can be viewed as misrepresentation. If it is determined that you intentionally provided false information, there could be legal consequences, including penalties or complications in future legal matters.
• Validity of Marriage: Generally, the validity of a marriage is not contingent on the date filed with the government, but rather on the legality of the marriage ceremony itself. Most jurisdictions recognize the marriage date as the date of the ceremony. However, if authorities determine that the true date of marriage was intentionally concealed, it could raise questions about the integrity of your filing.
• Potential for Penalties: Depending on local laws, there may be penalties for late registration of marriage or for filing false information. This could include fines or other administrative actions, but it typically does not render the marriage void.

For instance, in some states within the United States, if a couple is married but fails to register their marriage on time, the marriage remains valid, but they may face a fine or administrative issues when trying to obtain a marriage certificate later. In contrast, in other jurisdictions, intentionally providing false information could lead to stricter penalties.

It is advisable to:

• Consult a Legal Expert: Reach out to a family law attorney who is well-versed in marriage laws in your jurisdiction. They can provide specific advice based on local regulations and help clarify any risks you might face.
• Correct the Filing: If possible, you may want to consider correcting the filing with the Municipality. This may involve providing the correct date and explaining the situation. Transparency may help mitigate potential consequences.
• Keep Documentation: Maintain records of your marriage ceremony and any communications regarding the filing. This documentation can be beneficial if any legal issues arise in the future.

In conclusion, while your marriage is likely not void based on the information provided, the intentional misrepresentation on your application could lead to complications. Addressing the situation proactively with legal guidance is the best course of action to ensure that your marriage remains recognized and protected under the law.