Time Ago to Date Format Converter

import sys
from datetime import datetime, timedelta

def parse_time_ago(time_ago_str):
    number, unit, _ = time_ago_str.split()
    number = int(number)

    if "hour" in unit:
        return timedelta(hours=number)
    elif "day" in unit:
        return timedelta(days=number)
    elif "week" in unit:
        return timedelta(weeks=number)
    elif "month" in unit:
        # Approximate month as 30.44 days
        return timedelta(days=number * 30.44)
    elif "year" in unit:
        # Approximate year as 365.25 days
        return timedelta(days=number * 365.25)
    else:
        raise ValueError(f"Unknown time unit: {unit}")

def main(input_file, output_file):
    now = datetime.now()

    with open(input_file, 'r') as f:
        time_ago_list = f.readlines()

    result = []
    for time_ago in time_ago_list:
        time_ago = time_ago.strip()
        try:
            delta = parse_time_ago(time_ago)
            past_date = now - delta
            result.append(f"{time_ago}: {past_date.strftime('%Y-%m-%d %H:%M:%S')}\n")
        except ValueError as e:
            result.append(f"{time_ago}: Error - {str(e)}\n")

    with open(output_file, 'w') as f:
        f.writelines(result)

if __name__ == "__main__":
    if len(sys.argv) != 3:
        print("Usage: python datescript.py ago.txt date.txt")
    else:
        input_file = sys.argv[1]
        output_file = sys.argv[2]
        main(input_file, output_file)