NumPy: Convert numpy datetime64 to Timestamp

Last update on April 29 2025 13:01:36 (UTC/GMT +8 hours)

7. Convert np.datetime64 to Timestamp

Write a NumPy program to convert numpy datetime64 to Timestamp.

Sample Solution:-

Python Code:

# Importing the required libraries
import numpy as np
from datetime import datetime

# Getting the current date and time in UTC
dt = datetime.utcnow()

# Displaying the current date and time
print("Current date:")
print(dt)

# Converting the datetime object to a NumPy datetime64 object
dt64 = np.datetime64(dt)

# Calculating the timestamp from the datetime64 object
# The timestamp is calculated by subtracting the datetime '1970-01-01T00:00:00Z' from the current datetime
# Then it's divided by the number of seconds in one unit of timedelta64 to get the timestamp
ts = (dt64 - np.datetime64('1970-01-01T00:00:00Z')) / np.timedelta64(1, 's')

# Displaying the timestamp
print("Timestamp:")
print(ts)

# Converting the timestamp back to UTC datetime and displaying it
print("UTC from Timestamp:")
print(datetime.utcfromtimestamp(ts))

Sample Output:

Current date:                                                          
2017-04-01 08:01:12.722055                                             
Timestamp:                                                             
1491033672.72                                                          
UTC from Timestamp:                                                    
2017-04-01 08:01:12.722055                                             

Explanation:

In the above exercise –

dt = datetime.utcnow() - Get the current date and time using the datetime.utcnow() function and store it in the dt variable.

dt64 = np.datetime64(dt) - Convert the dt variable to a numpy datetime64 object using the np.datetime64() function and store it in the dt64 variable.

ts = (dt64 - np.datetime64('1970-01-01T00:00:00Z')) / np.timedelta64(1, 's') - Calculate the number of seconds that have elapsed since the Unix epoch (January 1, 1970 at 00:00:00 UTC) by subtracting the Unix epoch datetime from dt64, dividing the result by a numpy timedelta64 object representing one second, and storing the result in the ts variable.

print(datetime.utcfromtimestamp(ts)) - Convert the ts variable to a human-readable datetime object in UTC timezone using the datetime.utcfromtimestamp() function and finally print the result.

Pictorial Presentation:

For more Practice: Solve these Related Problems:

• Write a function that converts a numpy.datetime64 object to a POSIX timestamp (seconds since epoch) using .astype('M8[s]').
• Create a solution that converts a numpy.datetime64 array into Python datetime objects and then extracts their Unix timestamps.
• Implement a program that performs a round-trip conversion: from np.datetime64 to timestamp and back to np.datetime64, verifying consistency.
• Test the conversion on a series of dates and compare the results with those obtained from the time module in Python.

Go to:

• NumPy DateTime Exercises Home ↩
• NumPy Exercises Home ↩

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