DatePlus

DatePlus[date,n]

gives the date n days after date.

DatePlus[date,{n,step}]

gives the date n calendar steps after date.

DatePlus[date,{{n1,step1},{n2,step2},…}]

gives a date offset by ni steps of each specified size.

DatePlus[n]

gives the date n days after the current date.

DatePlus[offset]

gives the date with the specified offset from the current date.

Details and Options

  • DatePlus[date,-n] gives the date n days before date.
  • Dates 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 step sizes are calendar steps and day types "Year", "Quarter", "Month", "Week", "Day", "Hour", "Minute", "Second", "Weekday", "Weekend", Monday through Sunday, "EndOfMonth", and "BeginningOfMonth", "BusinessDay".
  • Offsets can also be specified using the Quantity framework.
  • {y,m,d} is taken to be equivalent to {y,m,d,0,0,0} etc.
  • DatePlus[date,offset] gives results in the same general format as date.
  • When date is a list, the result has the same length as date, possibly extended to include the smallest step in offset. »
  • When date is a string, the result is in the form specified by $DateStringFormat.
  • DatePlus takes the following options:
  • CalendarType"Gregorian"calendar 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  (5)

Add 35 days to January 1, 2017:

Use a date string as input:

Subtract 35 days from a date:

Add 14 weeks to a date:

Add 34 days to the current date:

Scope  (13)

Date Formats  (5)

DatePlus can take dates in the standard {y,m,d,h,m,s} format of DateList:

DatePlus can take dates in any format supported by DateString:

If a date is given as {y,m,d}, DatePlus returns in the same form:

{y,m} is interpreted as the first day of the specified month:

{y} is interpreted as January 1 of the specified year:

Increments  (8)

Add 10 months to a date:

Add 40 weeks to a date:

Add 7 weeks and 2 days:

Add 1 year to a date list:

Add 1 month and 15 days to the specified date:

The increment can be specified using the quantity framework:

Add 2.45 days:

Subtract 4.6 hours:

Options  (4)

CalendarType  (2)

Advance a date in the Jewish calendar:

Islamic years are shorter than Gregorian years:

HolidayCalendar  (2)

Compare the dates 250 business days away in different countries:

Different markets within a country may have different holiday schedules:

Properties & Relations  (2)

DatePlus adds calendar steps to dates, while DateDifference computes time distances between dates:

The inverse relationship:

Use $DateStringFormat to set the default format for date strings:

Possible Issues  (3)

Dates can be ambiguous:

Use DateList to disambiguate between different interpretations:

When list increments are specified, they are added from highest order to lowest:

The order in which calendar units are added can change the results of arithmetic operations, due to variable lengths for months and years:

Introduced in 2007
 (6.0)
 |
Updated in 2014
 (10.0)