Acually the calender in the future Krusty Krab says March 6, 4017 and Squidward was frozen for 2,000 years so Squidward got frozen on March 6, 2017 unless they mean around 2,000 years and the event happened closer to date of the airing of the episode.
The Khrome Krab's calendar read March 6, 4017; this means that the events took place at first on March 6, 2017, three and a half years from now. When the French Narrarator said, "2,000 Years Later", he did mean it by an exact amount (unless the Earth's orbit and days are longer than from 2017, then it has to be earlier than March 6, 4017). I don't think it takes place in March 6, 2017; that's a lazy estimate. It has to be earlier than that.