# Compare Dates and Time

This example shows how to compare datetime and duration arrays. You can perform an element-by-element comparison of values in two datetime arrays or two duration arrays using relational operators, such as > and <.

### Compare Datetime Arrays

Compare two datetime arrays. The arrays must be the same size or one can be a scalar.

A = datetime(2013,07,26) + calyears(0:2:6)
A = 1x4 datetime
26-Jul-2013   26-Jul-2015   26-Jul-2017   26-Jul-2019

B = datetime(2014,06,01)
B = datetime
01-Jun-2014

A < B
ans = 1x4 logical array

1   0   0   0

The < operator returns logical 1 (true) where a datetime in A occurs before a datetime in B.

Compare a datetime array to text representing a date.

A >= '26-Sep-2014'
ans = 1x4 logical array

0   1   1   1

Comparisons of datetime arrays account for the time zone information of each array.

Compare September 1, 2014 at 4:00 p.m. in Los Angeles with 5:00 p.m. on the same day in New York.

A = datetime(2014,09,01,16,0,0,'TimeZone','America/Los_Angeles',...
'Format','dd-MMM-yyyy HH:mm:ss Z')
A = datetime
01-Sep-2014 16:00:00 -0700

B = datetime(2014,09,01,17,0,0,'TimeZone','America/New_York',...
'Format','dd-MMM-yyyy HH:mm:ss Z')
B = datetime
01-Sep-2014 17:00:00 -0400

A < B
ans = logical
0

4:00 p.m. in Los Angeles occurs after 5:00 p.m. on the same day in New York.

### Compare Durations

Compare two duration arrays.

A = duration([2,30,30;3,15,0])
A = 2x1 duration
02:30:30
03:15:00

B = duration([2,40,0;2,50,0])
B = 2x1 duration
02:40:00
02:50:00

A >= B
ans = 2x1 logical array

0
1

Compare a duration array to a numeric array. Elements in the numeric array are treated as a number of fixed-length (24-hour) days.

A < [1; 1/24]
ans = 2x1 logical array

1
0

### Determine if Dates and Time Are Contained Within an Interval

Use the isbetween function to determine whether values in a datetime array lie within a closed interval.

Define endpoints of an interval.

tlower = datetime(2014,08,01)
tlower = datetime
01-Aug-2014

tupper = datetime(2014,09,01)
tupper = datetime
01-Sep-2014

Create a datetime array and determine whether the values lie within the interval bounded by t1 and t2.

A = datetime(2014,08,21) + calweeks(0:2)
A = 1x3 datetime
21-Aug-2014   28-Aug-2014   04-Sep-2014

tf = isbetween(A,tlower,tupper)
tf = 1x3 logical array

1   1   0