#!/usr/bin/env python3

import datetime
import sys

USAGE="""Usage: {program} PATH_TO_FILE""".format(program=sys.argv[0])

def die(message, code=1):
    print(message)
    sys.exit(code)

def die_usage(code=1):
    die(USAGE, code)

def read_date_from_file(path):
    text = open(path).readline().strip()
    try:
        time = datetime.datetime.strptime(text, '%Y-%m-%d')
    except ValueError as e:
        die(e)
    return time

def main(argv):
    if len(argv) < 2:
        die_usage()
    last = read_date_from_file(argv[1])
    now = datetime.datetime.now()
    diff = now - last
    days = diff.days
    #hours = diff.seconds // (60 * 60)
    if days == 1:
        msg = "1 day"
    else:
        msg = "{days} days".format(days=days)

    #msg += " "
    #if hours == 1:
    #    msg += "1 hour "
    #else:
    #    msg += "{hours} hours ".format(hours=hours)

    print(msg)

main(sys.argv)