Day [fr. dies, Lat.; tag, Germ.], in its largest sense the time of a whole apparent revolution of the sun round the earth, but , in its popular acceptation, that part of the twenty-four hours when it is light, or the space of time between the rising and the setting of the sun. by the Roman Calendar the day commenced at midnight; and most European nations reckon in the same manner.
In the space of a day all the twenty-four hours are usually reckoned. Therefore, in general, if I am bound to pay money on any certain day, I discharge the obligation if I pay it before twelve o'clock at night; after which the following day commences.
If anything is to be done within a certain time, of, from, or after the doing or occurrence of something else, the day on which the first act or occurrence takes place is to be excluded from the computation, Williams v. Burgess, (1840) 12 A&E 635. In certain legislative and justiciary acts, e.g., the proceedings of the House of Lords as recorded in the Journals of the House, Latin names of the days of the week are still used; they are as follows: Dies Solis. D. Lun',D. Martis, D. Mercurii, D. Jovis, D. Veneris,D. Saturni. See (English) Interpretation Act,1889, s. 36; and, further, HOLIDAY; FRACTION OF A DAY.
It means a period of twenty-four hours beginning at midnight. [Dangerous Machines (Regulation) Act, 1983 (35 of 1983), s. 3 (d); Also see Child Labour (Prohibition and Regulation) Act, 1986 (61 of 1986), s. 2 (iii)]
Day, as per English Calendar begins at midnight and covers a period of 24 hours, Raj Kumar Yadav v. Samir Kumar Mohaseth, (2005) 3 SCC 601.
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