In which a day is not really known exactly, "c. " can be used for "circa". Other examples are given at WP:APPROXDATE, although "fl. " for "floruit" should be prevented as it is not universally understood. Hundreds of years should not be abbreviated "c. " mainly because of the likely https://tarotdejesus23108.blogkoo.com/youtube-things-to-know-before-you-buy-54649539