Robbery at Millionaire's Mansion Logic Puzzle

A real lack of security at the county's Millionaire's Mansion led to three burglaries being committed during the last year - on 16th of February, 20th of June and 14th of August - and Detective Inspector Ima Sleuth was called in to investigate. The items stolen were a diamond necklace, a pair of sterling silver candlesticks and a silver salver. Because of the nature of the items stolen, D.I. Sleuth immediately threw suspicion on three well-known, but occasional, burglars in the neighborhood - "Lightfingers" Larry, "Calamity" Jane, and "Flash" Harry - who each have their own specialty. Suspicions were proved correct when each confessed to their crime and the items were recovered from the "fence" before they could be sold. However, the county's peculiar and unique justice system isn't much of a deterrent since the formula used to calculate the sentence time is "day times month, or a minimum of 10 days where such calculation is less than 10". The mansion's owner has since tightened security.

From this information and the following clues, for each burglar, can you determine the item which they stole, the date on which they committed the burglary and the sentence handed down to them?