January 13 is the thirteenth day of the year in the Gregorian calendar. In ordinary years 352 days remain until the year's end; in leap years the count is 353. The day's position in the annual cycle means it usually lies in the second week of January and well into winter in the Northern Hemisphere and summer in the Southern Hemisphere. For more on the calendar system in common use, see the Gregorian calendar.

Calendar, zodiac and astronomy

Astrologically, January 13 falls under the sign of Capricorn, which generally covers late December through mid-January. From an astronomical perspective the date is not tied to any fixed solar event; the timing of sunrise, sunset and the length of day vary considerably by latitude. Because of leap-year rules and calendar conventions, the remaining-day count differs in leap years; see references on leap years at leap years.

Religious and cultural observances

Various religious calendars and folk traditions attach significance to mid-January dates. In the Western Christian liturgical calendar, January 13 is the traditional feast day of St. Hilary of Poitiers. In some Eastern Orthodox and Slavic communities the evening of January 13 corresponds to celebrations tied to the Julian calendar new-year period — often described as the Old New Year's Eve — and is marked by local customs such as family gatherings, folk performances and seasonal rites.

Uses and notable contexts

As with any calendrical date, January 13 serves as a reference point for administrative, business and personal planning: tax, academic and fiscal schedules can reference the day when defining terms that fall in early January. The day is also a convenient marker in historical timelines and anniversary observances.

Distinctions and facts

  • It is the 13th day of the year: an early point in January that often follows end-of-year holidays and the resumption of normal institutions.
  • Because it is close to the midpoint of January, the day is sometimes used symbolically for assessing early-year trends in economics, culture and sport.
  • Local and regional traditions may assign special meanings to the date; these vary widely by country and community.

For further context on how January 13 fits into the wider calendar and year-cycle, consult general references on the Gregorian calendar and leap-year calculations linked above.