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DayRound[date,daytype]

rounds date to the nearest day of daytype, using the next-day rounding convention.

DayRound[date,daytype,rounding]

rounds date to the nearest day of daytype, using rounding.

Details and Options
Details and Options Details and Options
Examples  
Basic Examples  
Scope  
Options  
CalendarType  
HolidayCalendar  
Applications  
See Also
Related Guides
History
Cite this Page

DayRound

DayRound[date,daytype]

rounds date to the nearest day of daytype, using the next-day rounding convention.

DayRound[date,daytype,rounding]

rounds date to the nearest day of daytype, using rounding.

Details and Options

  • DayRound returns a DateObject expression.
  • A date can be specified in the following forms:
  • DateObject[…]date object
    {y,m,d}year, month, day
    {y,m}the first day of the specified month
    {y}January 1 of the year y
    "string"date as a string ("Jan. 1, 2000")
    {y,m,d,h,m,s}precise time
    timeabsolute time specification
  • Possible day types are:
  • Allany calendar date (default)
    "Weekday"date considered a weekday
    "Weekend"date considered a weekend
    "Holiday" holiday according to HolidayCalendar
    "NonHoliday"date that is not a holiday
    "BusinessDay"non-holiday weekday
    "NonBusinessDay"holiday or weekend
    "WeekdayHoliday"holiday on a weekday
    "WeekendHoliday"holiday on a weekend
    "WeekendNonHoliday"non-holiday weekend
    Monday, Tuesday, …a specific day of the week
    "EndOfMonth"final day of a given month
    "BeginningOfMonth"first day of a given month
  • In the Jewish calendar, the weekdays are Sunday through Thursday.
  • DayRound[date] is equivalent to DayRound[date,All].
  • Recognized rounding values are: "Next", "Following", "ModifiedFollowing", "Preceding", "Previous", and "ModifiedPreceding".
  • If date is of daytype, DayRound has no effect.
  • DayRound takes the following options:
  • CalendarTypeAutomaticcalendar in which the dates have been specified
    HolidayCalendar{"UnitedStates","Default"}holiday schedule and subspecification for the business day and holiday computations

Examples

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Basic Examples  (3)

Adjust the first of the year to the nearest following business day:

Wolfram Language code: DayRound[{2022}, "BusinessDay"]

Determine the nearest weekend day following the beginning of February 2012:

Wolfram Language code: DayRound[{2022, 2}, "Weekend"]

Find the next Sunday:

Wolfram Language code: DayRound[{2022, 2, 1}, Sunday]

If no day type specification is given, the date will be rounded to "Day" granularity:

Wolfram Language code: DayRound[Now]

Scope  (2)

Adjust a date, subject to a business day convention:

Wolfram Language code: DayRound[{2021}, "BusinessDay", "ModifiedFollowing"]

"ModifiedFollowing" rounds to the next business day, unless it is in another month:

Wolfram Language code: DayRound[{2022, 3, 31}, "BusinessDay", "ModifiedFollowing"]

Options  (2)

CalendarType  (1)

Compute the next business day using Jewish calendar dates:

Wolfram Language code: DayRound[Today, "BusinessDay", CalendarType -> "Jewish"]

HolidayCalendar  (1)

Different markets within a country may have different holiday schedules:

Wolfram Language code: Table[DayRound[{2022, 1, 16}, "BusinessDay", "ModifiedFollowing", HolidayCalendar -> {"UnitedStates", i}], {i, CalendarData["UnitedStates"]}]

Applications  (1)

Adjust a date, subject to various conventions:

Wolfram Language code: Table[DayRound[{2022, 1, 1}, "BusinessDay", i], {i, {"Following", "ModifiedFollowing", "Previous", "ModifiedPreceding"}}]
Wolfram Research (2012), DayRound, Wolfram Language function, https://reference.wolfram.com/language/ref/DayRound.html (updated 2025).

Text

Wolfram Research (2012), DayRound, Wolfram Language function, https://reference.wolfram.com/language/ref/DayRound.html (updated 2025).

CMS

Wolfram Language. 2012. "DayRound." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2025. https://reference.wolfram.com/language/ref/DayRound.html.

APA

Wolfram Language. (2012). DayRound. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DayRound.html

BibTeX

@misc{reference.wolfram_2026_dayround, author="Wolfram Research", title="{DayRound}", year="2025", howpublished="\url{https://reference.wolfram.com/language/ref/DayRound.html}", note=[Accessed: 12-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_dayround, organization={Wolfram Research}, title={DayRound}, year={2025}, url={https://reference.wolfram.com/language/ref/DayRound.html}, note=[Accessed: 12-June-2026]}