如果我们想知道从当前日期算起的总天数，比如2周、3个月、1年后

// 获取当前日期
var currentDate = new Date();

// 计算2周后的日期
var twoWeeksLater = new Date(currentDate.getTime() + (14 * 24 * 60 * 60 * 1000));

// 计算3个月后的日期
var threeMonthsLater = new Date(currentDate.getFullYear(), currentDate.getMonth() + 3, currentDate.getDate());

// 计算1年后的日期
var oneYearLater = new Date(currentDate.getFullYear() + 1, currentDate.getMonth(), currentDate.getDate());

// 获取总天数
var totalDays = Math.floor((oneYearLater - currentDate) / (24 * 60 * 60 * 1000));

console.log("2周后的日期：" + twoWeeksLater.toLocaleDateString());
console.log("3个月后的日期：" + threeMonthsLater.toLocaleDateString());
console.log("1年后的日期：" + oneYearLater.toLocaleDateString());
console.log("总天数：" + totalDays);

import datetime

# 获取当前日期
current_date = datetime.date.today()

# 计算2周后的日期
two_weeks_later = current_date + datetime.timedelta(weeks=2)

# 计算3个月后的日期
three_months_later = current_date + datetime.timedelta(months=3)

# 计算1年后的日期
one_year_later = current_date + datetime.timedelta(years=1)

# 获取总天数
total_days = (one_year_later - current_date).days

print("2周后的日期：", two_weeks_later)
print("3个月后的日期：", three_months_later)
print("1年后的日期：", one_year_later)
print("总天数：", total_days)