Collection of functions to process dates(Project) .ipynb

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    "\"\"\"\n",
    "Project of \"Python Programming Essentials\".\n",
    "Collection of functions to process dates.\n",
    "\n",
    "\"\"\"\n",
    "\n",
    "import datetime\n",
    "\n",
    "def days_in_month(year, month):\n",
    "    \"\"\"\n",
    "    Inputs:\n",
    "      year  - an integer between datetime.MINYEAR and datetime.MAXYEAR\n",
    "              representing the year\n",
    "      month - an integer between 1 and 12 representing the month\n",
    "      \n",
    "    Returns:\n",
    "      The number of days in the input month.\n",
    "    \"\"\"\n",
    "    if datetime.MINYEAR <= year <= datetime.MAXYEAR:\n",
    "        if month == 12:\n",
    "            no_of_days = datetime.date(year+1, month-11, 1)-datetime.date(year, month, 1)\n",
    "            return (no_of_days.days)\n",
    "        elif 1 <= (month) < 12:\n",
    "            no_of_days = datetime.date(year, month+1, 1)-datetime.date(year, month, 1)\n",
    "            return (no_of_days.days)\n",
    "        else:\n",
    "            return 0\n",
    "    else:\n",
    "        return 0\n",
    "\n",
    "def is_valid_date(year, month, day):\n",
    "    \"\"\"\n",
    "    Inputs:\n",
    "      year  - an integer representing the year\n",
    "      month - an integer representing the month\n",
    "      day   - an integer representing the day\n",
    "\n",
    "    Returns:\n",
    "      True if year-month-day is a valid date and\n",
    "      False otherwise\n",
    "    \"\"\"\n",
    "    if datetime.MINYEAR <= year <= datetime.MAXYEAR:\n",
    "        if 1 <= (month) <= 12:\n",
    "            if month == 2:\n",
    "                if (year % 4) == 0:\n",
    "                    if 1 <= (day) <= 29:\n",
    "                        ans = True\n",
    "                    else:\n",
    "                        ans = False\n",
    "                else:\n",
    "                    if 1 <= (day) <= 28:\n",
    "                        ans = True\n",
    "                    else:\n",
    "                        ans = False\n",
    "            elif month != 2:\n",
    "                if 1 <= (day) <= 31:\n",
    "                    ans = True\n",
    "                else:\n",
    "                    ans = False\n",
    "            else:\n",
    "                ans = False\n",
    "        else:\n",
    "            ans = False\n",
    "    else:\n",
    "        ans = False\n",
    "        \n",
    "    return ans\n",
    "\n",
    "def days_between(year1, month1, day1, year2, month2, day2):\n",
    "    \"\"\"\n",
    "    Inputs:\n",
    "      year1  - an integer representing the year of the first date\n",
    "      month1 - an integer representing the month of the first date\n",
    "      day1   - an integer representing the day of the first date\n",
    "      year2  - an integer representing the year of the second date\n",
    "      month2 - an integer representing the month of the second date\n",
    "      day2   - an integer representing the day of the second date\n",
    "\n",
    "    Returns:\n",
    "      The number of days from the first date to the second date.\n",
    "      Returns 0 if either date is invalid or the second date is\n",
    "      before the first date.\n",
    "    \"\"\"\n",
    "    if is_valid_date(year1, month1, day1):\n",
    "        if is_valid_date(year2, month2, day2):\n",
    "            if datetime.date(year1, month1, day1) > datetime.date(year2, month2, day2):\n",
    "                return 0\n",
    "            else:\n",
    "                no_of_days = datetime.date(year2, month2, day2) - datetime.date(year1, month1, day1)\n",
    "                return (no_of_days.days)\n",
    "        else:\n",
    "            return 0\n",
    "    else:\n",
    "        return 0\n",
    "\n",
    "def age_in_days(year, month, day):\n",
    "    \"\"\"\n",
    "    Inputs:\n",
    "      year  - an integer representing the birthday year\n",
    "      month - an integer representing the birthday month\n",
    "      day   - an integer representing the birthday day\n",
    "\n",
    "    Returns:\n",
    "      The age of a person with the input birthday as of today.\n",
    "      Returns 0 if the input date is invalid or if the input\n",
    "      date is in the future.\n",
    "    \"\"\"\n",
    "    if month == 2:\n",
    "        if 1 <= (day) <= 29:\n",
    "            curr_day = datetime.date.today()\n",
    "            tot_days = days_between(year, month, day, curr_day.year, curr_day.month, curr_day.day)\n",
    "    elif month != 2:\n",
    "        if 1 <= (day) <= 31:\n",
    "            curr_day = datetime.date.today()\n",
    "            tot_days = days_between(year, month, day, curr_day.year, curr_day.month, curr_day.day)\n",
    "        else:\n",
    "            return 0\n",
    "\n",
    "        return (tot_days)\n",
    "    return 0\n",
    "\n",
    "print(is_valid_date(1827, 12, 32))"
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