using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Globalization;

namespace LearnCSharp_1
{
    class LearnDate
    {
        static void Main_LearnDate(string[] args)
        {
            DateTime now = DateTime.Now;
            Console.WriteLine(now.ToString("F")); // F说明符创建完整的日期和时间模式。
            Console.ReadKey();

            string[] months = { "January", "February", "March", "April", "May", "June", "July", "September", "October", "November", "December" };
            Console.WriteLine("Today's date: {0}", now.Date);
            Console.WriteLine("Today is {0} day of {1}", now.Day, months[now.Month - 1]);
            Console.WriteLine("Today is {0} day of {1}", now.DayOfYear, now.Year);
            Console.WriteLine("Today's time: {0}", now.TimeOfDay);
            Console.WriteLine("Hour: {0}", now.Hour);
            Console.WriteLine("Minute: {0}", now.Minute);
            Console.WriteLine("Second: {0}", now.Second);
            Console.WriteLine("Millisecond: {0}", now.Millisecond);
            Console.WriteLine("The day of week: {0}", now.DayOfWeek);
            Console.WriteLine("Kind: {0}", now.Kind);
            Console.ReadKey();

            DateTime dt = new DateTime(2019, 2, 22, 14, 0, 0);
            DateTime dt1 = dt.AddSeconds(55);
            DateTime dt2 = dt.AddMinutes(30);
            DateTime dt3 = dt.AddHours(72);
            DateTime dt4 = dt.AddDays(65);
            DateTime dt5 = dt.AddDays(-65);
            DateTime dt6 = dt.AddMonths(3);
            DateTime dt7 = dt.AddYears(4);

            Console.WriteLine(dt1.ToString("F"));
            Console.WriteLine(dt2.ToString("F"));
            Console.WriteLine(dt3.ToString("F"));
            Console.WriteLine(dt4.ToString("F"));
            Console.WriteLine(dt5.ToString("F"));
            Console.WriteLine(dt6.ToString("F"));
            Console.WriteLine(dt7.ToString("F"));

            DateTime utc = DateTime.UtcNow;
            Console.WriteLine($"UTC time {utc:HH:mm:ss}");
            Console.ReadKey();

            Console.OutputEncoding = System.Text.Encoding.UTF8;
            CultureInfo ci = new CultureInfo("sk-SK");
            Console.WriteLine($"Dnesny datum a cas: {now.ToString("F", ci)}");
            Console.ReadKey();

            string startTime = "7:00 AM";
            string endTime = "8:30 PM";
            TimeSpan elapsed = DateTime.Parse(endTime).Subtract(DateTime.Parse(startTime));
            Console.WriteLine($"Time elapsed: {elapsed}");
            Console.ReadKey();

            DateTime borodino_battle = new DateTime(1812, 9, 7);
            TimeSpan diff = DateTime.Today - borodino_battle;
            Console.WriteLine($"{diff.TotalDays} days have passed since the Battle of Borodino.");

            // 获得本地时区
            TimeZoneInfo localZone = TimeZoneInfo.Local;
            Console.WriteLine("Current timezone: {0}", localZone.StandardName); // 时区的标准名称
            Console.WriteLine("Daylight name: {0}", localZone.DaylightName); // 时区的夏令名称
            Console.WriteLine("Bias: {0}", localZone.BaseUtcOffset);
            Console.ReadKey();

            var timezones = TimeZoneInfo.GetSystemTimeZones();
            foreach (var timezone in timezones)
            {
                Console.WriteLine(timezone.Id);
            }


        }
    }
}