work_hours.py

from datetime import datetime


def validate_workday(date_to_check):

    # valid work days
    # Monday = 1
    # Tuesday = 2
    # Wednesday = 3
    # Thursday = 4
    # Friday = 5
    work_days = [1, 2, 3, 4, 5]
    if date_to_check.isoweekday() in work_days:
        return True
    else:
        return False


def reformatted_date_value(date_string):
    date_time_obj =  datetime.strptime(date_string, '%Y-%m-%d %H:%M:%S.%f')
    date_time_iso_string = datetime.strptime(date_string, '%Y-%m-%d %H:%M:%S.%f').strftime('%Y, %m, %d, %H, %M, %S, %f')
    return date_time_obj, date_time_iso_string


def get_work_hours(reformatted_date):
    date_string_split = reformatted_date.split(',')
    year = int(date_string_split[0])
    month = int(date_string_split[1])
    day = int(date_string_split[2])
    hour = int(date_string_split[3])
    minute = int(date_string_split[4])
    microsecond = int(date_string_split[5])

    date_stamp = datetime(year=year,
                          month=month,
                          day=day,
                          hour=hour,
                          minute=minute,
                          microsecond=microsecond)

    work_start_time = date_stamp.replace(hour=9, minute=0, second=0, microsecond=0)
    work_end_time = date_stamp.replace(hour=18, minute=0, second=0, microsecond=0)
    return work_start_time, work_end_time


def time_diff(date_stamp, work_start_time, work_end_time):
    if work_start_time <= date_stamp <= work_end_time:
        print('The time is inside normal work hours')
        start_time_diff = date_stamp - work_start_time
        end_time_diff = work_end_time - date_stamp
        print(f'Workday started {start_time_diff} hours ago')
        print(f'Workday ends in {end_time_diff}')
        print('\n')
    else:
        print('The time is outside normal work hours')
        print('\n')


date_strings = ['2022-08-02 17:02:07.645241', '2022-08-06 17:02:07.645241']
for date_string in date_strings:
    reformatted_dates = reformatted_date_value(date_string)
    is_work_day  = validate_workday(reformatted_dates[0])
    if is_work_day:
        print(f'Date stamp: {date_string}')
        work_hours = get_work_hours(reformatted_dates[1])
        start_time = work_hours[0]
        end_time = work_hours[1]
        date_var = reformatted_dates[0]
        time_diff(date_var, start_time, end_time)
    else:
        print(f'Date stamp: {date_string}')
        print('Not a work day')
        print('\n')