Wrong last day of work on approved EDD claim - can I fix this mistake?

Don't panic! This is a common mistake and definitely fixable. You need to contact EDD to report the correction. The sooner you fix it, the better. Since you've already received payment, they might need to recalculate your benefit amount if the correct date affects your base period. But being proactive about correcting it will show it was an honest mistake, not fraud.

same thing hapnd to me but with the wrong employer name lol. dont stress it they wont come after u for something this small

You definitely need to correct this. Call EDD at 1-800-300-5616 and explain the situation. The changed date could affect your base period (which determines your benefit amount), so they'll need to review your claim. Make sure you document the call details - get the rep's ID number and notes about what they tell you. I struggled for weeks trying to reach EDD about a similar issue. After 50+ calls, I finally tried Claimyr (claimyr.com) which got me connected to an EDD rep in about 20 minutes. They have a video showing how it works: https://youtu.be/JmuwXR7HA10?si=TSwYbu_GOwYzt9km. Worth it when you need to fix something important like this.

Isn't the base period for unemployment the first 4 of the last 5 completed quarters before you file? So changing your last day worked by a month might actually change which quarter counts in your base period and affect your weekly benefit amount.

I went through something similar and learned that EDD distinguishes between unintentional mistakes and willful misrepresentation. What you're describing is clearly an honest error. When you speak with EDD, specifically ask them to document that you self-reported the error. Request that they note it was an unintentional mistake to avoid any penalty weeks. Also ask them to explain if/how this will affect your benefit calculation. One important thing - if your benefit amount changes and results in an overpayment, request a waiver form DE 1446. You can request a waiver for overpayments that weren't your fault or if repayment would cause financial hardship.

anyone know if ur still eligible for ui if you switch from w2 to 1099 at the same company??? my boss is trying to change my status but i think im getting laid off soon

Update: I finally got through to EDD this morning! The representative was actually really understanding. They're going to correct the date in their system and recalculate my benefits. She said since I reported it myself, they'll just note it as a claimant-reported correction with no fraud issues. My weekly benefit amount might change slightly, but she didn't think it would be dramatic. Thank you all for the advice and helping me not panic!