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dateshift

Shift date or generate sequence of dates and time

Syntax

t2 = dateshift(t,'start',unit)
t2 = dateshift(t,'end',unit)
t2 = dateshift(t,'dayofweek',dow)
t2 = dateshift(___,rule)

Description

t2 = dateshift(t,'start',unit) shifts each value in the datetime array t back to the beginning of the unit of time specified by unit. The output t2 is the same size as t.

example

t2 = dateshift(t,'end',unit) shifts the values ahead to the end of the unit of time specified by unit. The end of a day, hour, minute, or second is also the beginning of the next one. For example, the end of a day occurs at midnight at the beginning of the next day. The end of a year, quarter, month, or week is midnight at the beginning of the last day of that time period.

example

t2 = dateshift(t,'dayofweek',dow) returns the next occurrence of the specified day of the week on or after each datetime in array t. If the date in t falls on the specified day of the week, then dateshift returns the same date.

example

t2 = dateshift(___,rule) shifts each value in array t according to the pattern specified by rule. You can use this syntax with any of the arguments in the previous syntaxes.

Examples

collapse all

Define the current date.

t = datetime('today')
t = datetime
   19-Sep-2017

Shift the date to the end of the same month.

t2 = dateshift(t,'end','month')
t2 = datetime
   30-Sep-2017

Define the current date.

t = datetime('today')
t = datetime
   19-Sep-2017

Shift the date to the start of the next month.

t2 = dateshift(t,'start','month','next')
t2 = datetime
   01-Oct-2017

Shift the date to the end of the next month.

t2 = dateshift(t,'end','month','next')
t2 = datetime
   31-Oct-2017

Shift an array of dates forward to the next Friday.

t = datetime([2014,08,03;2014,04,15])
t = 2x1 datetime array
   03-Aug-2014
   15-Apr-2014

t2 = dateshift(t,'dayofweek','Friday')
t2 = 2x1 datetime array
   08-Aug-2014
   18-Apr-2014

Shift the array of dates backward to the previous Monday.

t2 = dateshift(t,'dayofweek','Monday','previous')
t2 = 2x1 datetime array
   28-Jul-2014
   14-Apr-2014

Find the date that falls at the end of the fifth week from today.

t = datetime('today')
t = datetime
   19-Sep-2017

t2 = dateshift(t,'end','week',5)
t2 = datetime
   28-Oct-2017

Generate a sequence of dates consisting of the next three occurrences of Friday.

t = datetime('today')
t = datetime
   19-Sep-2017

t2 = dateshift(t,'dayofweek','Friday',1:3)
t2 = 1x3 datetime array
   22-Sep-2017   29-Sep-2017   06-Oct-2017

Input Arguments

collapse all

Input date and time, specified as a datetime array.

Unit of time, specified as one of the following values:

  • 'year'

  • 'quarter'

  • 'month'

  • 'week'

  • 'day'

  • 'hour'

  • 'minute'

  • 'second'

Day of the week, specified as a scalar integer indicating the day of week number, or a character vector or string scalar containing a localized day name.

Example: 'Sunday'

Example: 1

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | char | string

Rule for shifting datetime values, specified as a character vector, string scalar, scalar integer, or an array of integer values. If rule is a character vector or string, it must be one of the following.

Value of ruleDescription
'next'Shift datetime to next unit of time or specified day.
(Default rule for day of week.)
'previous'Shift datetime to previous unit of time or specified day.
'nearest'Shift datetime to nearest occurrence of unit of time or specified day.
'current'Shift datetime within the current unit of time, or to the specified day in the current week.
(Default rule for unit of time.)

If rule is an integer or an array of integers, then:

  • When used with the input argument, unit, 0 corresponds to the start or end of the current unit for each datetime, 1 corresponds to the next unit, -1 corresponds to the previous unit, and so on.

  • When used with the input argument, dow, 0 corresponds to the specified day in the current week for each datetime, 1 corresponds to the next occurrence of the specified day, -1 corresponds to the previous occurrence, and so on.

  • t and rule must be the same size, or one must be a scalar.

If you specify 'dayofweek' and t contains datetime values that fall on that day of the week, then dateshift treats those datetime values as the next or previous occurrences of the specified day of the week. For example, dateshift(datetime(2015,12,24),'dayofweek','thu',rule) returns a datetime value with a date of December 24, 2015 if rule is 'next', 'previous', 1, or -1, because December 24, 2015 is a Thursday.

Extended Capabilities

See Also

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Introduced in R2014b

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