Test array values for NaT (not a time) in Numpy

To test array for NaT, use the numpy.isnat() method in Python Numpy. The condition is broadcast over the input. At locations where the condition is True, the out array will be set to the ufunc result. Elsewhere, the out array will retain its original value. Note that if an uninitialized out array is created via the default out=None, locations within it where the condition is False will remain uninitialized.

The out is a location into which the result is stored. If provided, it must have a shape that the inputs broadcast to. If not provided or None, a freshly-allocated array is returned. A tuple (possible only as a keyword argument) must have length equal to the number of outputs.

Steps

At first, import the required library −

import numpy as np

Create an array with some nat and date values −

arr = np.array(["2021-12-22", "NaT", "NAT", "nAt", '2021-12'], dtype="datetime64[ns]")

Display the array −

print("Array...
", arr)

Get the type of the array −

print("
Our Array type...
", arr.dtype)

Get the dimensions of the Array −

print("
Our Array Dimensions...
",arr.ndim)

Get the number of elements in the Array −

print("
Number of elements...
", arr.size)

To test array for NaT, use the numpy.isnat() method in Python Numpy −

print("
Test array for NaT...
",np.isnat(arr))

Example

import numpy as np

# Create an array with some nat and date values
arr = np.array(["2021-12-22", "NaT", "NAT", "nAt", '2021-12'], dtype="datetime64[ns]")

# Display the array
print("Array...
", arr)

# Get the type of the array
print("
Our Array type...
", arr.dtype)

# Get the dimensions of the Array
print("
Our Array Dimensions...
",arr.ndim)

# Get the number of elements in the Array
print("
Number of elements...
", arr.size)

# To test array for NaT, use the numpy.isnat() method in Python Numpy
print("
Test array for NaT...
",np.isnat(arr))

Output

Array...
['2021-12-22T00:00:00.000000000' 'NaT'
'NaT' 'NaT'
'2021-12-01T00:00:00.000000000']

Our Array type...
datetime64[ns]

Our Array Dimensions...
1

Number of elements...
5

Test array for NaT...
[False True True True False]