28 January

28 January (the Twenty-Eighth of January, January 28th, &c.) is the twenty-eighth day of the year under the Gregorian calendar, as first promulgated by Pope Gregory XIII, Bishop of Rome, in 1582 A.D., as well as the earlier Julian calendar, as first promulgated by Julius Caesar in 45 B.C. The date of 28 January is followed by either 337 days or 338 days during leap years, which are calculated differently in Gregorian and Julian calendars; in both calendars, regardless of its leap year status, the date that follows is 29 January and the date that precedes it is 27 January.

Note that for the purposes of the following indices, the Gregorian date trumps the Julian date, unless otherwise indicated.

Births

• Valentina Kirlian (1904-1971), co-developer of Kirlian photography