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He was born the son of George and Jane Day in 1797 and christened at St James, Clerkenwell in 1808.
He married Emma Day at St Pancras Chapel, Camden in 1829; both were from that parish.
Their son George was christened at St Andrew, Holborn in 1830. Charles was recorded as a silversmith from 5 Little Warner Street, Clerkenwell.
He appears on the 1841 UK Census at Paradise Place, St Luke’s parish, Finsbury, in 1851 at 55 Church Street, Bethnal Green and in 1861 at 31 Rawstone Street, Clerkenwell all as a silversmith.
He was recorded at 19 Ann’s Place, Bethnal Green in 1871 as a Goldsmiths’ pensioner.
His death was registered at Shoreditch in 1881.

The below report likely refers to Charles Day:

Guildhall. — Joseph Burt, a young man, who had been articled with Mr. Day, a silver-spoon-maker in Lilypot-lane, near Falcon-square, was brought before Mr. Alderman Ansley yesterday, charged with stealing about five ounces of silver cuttings and shavings.

It appeared that he offered this refuse silver for sale at Mr. Sirrell's, a refiner, in Barbican, on Friday last, and gave his address as "Mr. Smith, 13, Marylebone-street." The shopman declined paying him until the following day, that he might satisfy himself that the prisoner had given a true account of himself. Upon inquiry, it proved that this address was fictitious, and that the prisoner omitted to call for his money. Mr. Sirrell then sent the silver round among the spoon makers, and among others to Messrs. Eley, of Paternoster-row, who partly identified it, and exhibited it to Mr. Day, one of their outdoor workers, by whom it was at once recognized. The prisoner was then sent to Mr. Sirrell's on an errand, and being identified as the person who called himself Mr. Smith, was shortly afterwards apprehended.

Mr. Day said he had missed a considerable quantity of such silver, and the prisoner had been eight months in his service.

The prisoner, under the advice of his solicitor, did not attempt any defence, and was committed.

Source: The Standard - 22nd November 1827