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How to check if datetime is first day of week in Python using UliEngineering

You can easily check if datetime values are the first day of the week (Monday) using the UliEngineering Python library:

is_first_day_of_week.py
import numpy as np
from UliEngineering.Utils.Date import *

# Check individual dates
print(f"Is 2024-01-01 first of week? {is_first_day_of_week('2024-01-01')}")
print(f"Is 2024-01-08 first of week? {is_first_day_of_week('2024-01-08')}")

# Check NumPy datetime64 array
dates = np.array(['2024-01-01', '2024-01-02', '2024-01-08', '2024-01-09'], dtype='datetime64[D]')
result = is_first_day_of_week(dates)
print(f"\nFirst of week check: {result}")

Example output

is_first_day_of_week_output.txt
Is 2024-01-01 first of week? True
Is 2024-01-08 first of week? True

First of week check: [ True False  True False]

The is_first_day_of_week() function works with both individual dates and NumPy datetime64 arrays, returning a boolean array for array inputs.

Check out similar posts by category: Python, NumPy