Is your reliance on memory the problem? Recently in writing a blog post involving the 1910 census, I nearly stated the census date was 1 April 1910 and that my great-aunt, born on 8 April 1910 should not have been listed. In reviewing before the item was published, I was reminded that the census date in 1910 was 15 April, not 1 April. In this case, it was me who was wrong, not the census. Memories are not always perfect.