Represent Dates and Times inMATLAB

The primary way to store date and time information is indatetimearrays, which support arithmetic, sorting, comparisons, plotting, and formatted display. The results of arithmetic differences are returned indurationarrays or, when you use calendar-based functions, incalendarDurationarrays.

例如,创建一个MATLAB^®datetime array that represents two dates: June 28, 2014 at 6 a.m. and June 28, 2014 at 7 a.m. Specify numeric values for the year, month, day, hour, minute, and second components for the datetime.

t = datetime(2014,6,28,6:7,0,0)

t = 28-Jun-2014 06:00:00 28-Jun-2014 07:00:00

Change the value of a date or time component by assigning new values to the properties of the datetime array. For example, change the day number of each datetime by assigning new values to theDayproperty.

t.Day = 27:28

t = 27-Jun-2014 06:00:00 28-Jun-2014 07:00:00

Change the display format of the array by changing itsFormatproperty. The following format does not display any time components. However, the values in the datetime array do not change.

t.Format ='MMM dd, yyyy'

t = Jun 27, 2014 Jun 28, 2014

If you subtract onedatetimearray from another, the result is adurationarray in units of fixed length.

t2 = datetime(2014,6,29,6,30,45)

t2 = 29-Jun-2014 06:30:45

d = t2 - t

d = 48:30:45 23:30:45

By default, adurationarray displays in the format, hours:minutes:seconds. Change the display format of the duration by changing itsFormatproperty. You can display the duration value with a single unit, such as hours.

d.Format ='h'

d = 48.512 hrs 23.512 hrs

You can create a duration in a single unit using theseconds,minutes,hours,days, oryears功能。For example, create a duration of 2 days, where each day is exactly 24 hours.

d = days(2)

d = 2 days

You can create a calendar duration in a single unit of variable length. For example, one month can be 28, 29, 30, or 31 days long. Specify a calendar duration of 2 months.

L = calmonths (2)

L = 2mo

Use thecaldays,calweeks,calquarters, andcalyearsfunctions to specify calendar durations in other units.

Add a number of calendar months and calendar days. The number of days remains separate from the number of months because the number of days in a month is not fixed, and cannot be determined until you add the calendar duration to a specific datetime.

L = calmonths (2)+ caldays(35)

L = 2mo 35d

Add calendar durations to a datetime to compute a new date.

t2 = t + calmonths(2) + caldays(35)

t2 = Oct 01, 2014 Oct 02, 2014

t2is also adatetimearray.

whost2

Name Size Bytes Class Attributes t2 1x2 161 datetime

In summary, there are several ways to represent dates and times, and MATLAB has a data type for each approach:

See Also

datetime|duration|calendarDuration