在本教程中，我们将讨论如何编写一个 Python 程序来查找两个给定数字之间的天数。
假设我们给出了两个日期，我们的预期输出将是:
示例:
Input: Date_1 = 12/10/2021, Date_2 = 31/08/2022
Output: Number of Days between the given Dates are: 323 days
Input: Date_1 = 10/09/2023, Date_2 = 04/02/2025
Output: Number of Days between the given Dates are: 323 days: 513 days
方法 1:天真的方法
在这种方法中，天真的解决方案将从 date_1 开始，它将继续计算天数，直到到达 date_2。该解决方案将需要超过 O(1) 次。这是一个计算 date_1 之前的总天数的简单解决方案，这意味着它将计算从 00/00/0000 到 date_1 的总天数，然后它将计算 date_2 之前的总天数。最后，它将以两个给定日期之间的总天数的形式返回两个计数之间的差异。
示例:
# First, we will create a class for dates
class date_n:
def __init__(self, day, month, year):
self.day = day
self.month = month
self.year = year
# For storng number of days in all months from
# January to December.
month_Days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
# This function will count the number of leap years from 00/00/0000 to the #given date
def count_Leap_Years(day):
years = day.year
# Now, it will check if the current year should be considered for the count # of leap years or not.
if (day.month <= 2):
years -= 1
# The condition for an year is a leap year: if te year is a multiple of 4, and a # multiple of 400 but not a multiple of 100.
return int(years / 4) - int(years / 100) + int(years / 400)
# This function will return number of days between two given dates
def get_difference(date_1, date_2):
# Now, it will count total number of days before first date "date_1"
# Then, it will initialize the count by using years and day
n_1 = date_1.year * 365 + date_1.day
# then, it will add days for months in the given date
for K in range(0, date_1.month - 1):
n_1 += month_Days[K]
# As every leap year is of 366 days, we will add
# a day for every leap year
n_1 += count_Leap_Years(date_1)
# SIMILARLY, it will count total number of days before second date "date_2"
n_2 = date_2.year * 365 + date_2.day
for K in range(0, date_2.month - 1):
n_2 += month_Days[K]
n_2 += count_Leap_Years(date_2)
# Then, it will return the difference between two counts
return (n_2 - n_1)
# Driver program
date_1 = date_n(12, 10, 2021)
date_2 = date_n(30, 8, 2022)
print ("Number of Days between the given Dates are: ", get_difference(date_1, date_2), "days")
输出:
Number of Days between the given Dates are: 322 days
方法 2:使用 Python 日期时间模块
在这个方法中，我们将看到如何使用 Python 的内置函数“datetime”，它可以帮助用户解决各种日期时间相关的问题。为了找出两个日期之间的差异，我们可以以日期类型格式输入两个日期并减去它们，这将导致输出两个给定日期之间的天数。
示例:
from datetime import date as date_n
def number_of_days(date_1, date_2):
return (date_2 - date_1).days
# Driver program
date_1 = date_n(2023, 9, 10)
date_2 = date_n(2025, 2, 4)
print ("Number of Days between the given Dates are: ", number_of_days(date_1, date_2), "days")
输出:
Number of Days between the given Dates are: 513 days
结论
在本教程中，我们讨论了如何编写 python 代码来查找两个给定日期之间的总天数的两种不同方法。