一个UnversalTime与本地时间相互转换的工具

这是个小例侱，用于UnversalTime与本地时间的相互转换，最底下的两个空格时用来计算离现在X小时Y分前的时间的。本例程用Visual Studio 2010开发。.NET Framework 4.0。由于嫌麻烦我把修改DateTimePicker值的方法写成了一个事件。这个例程也可以算是个自定义事件的例程吧。

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace UTC_LocalTime{    public partial class Form1 : Form    {        private DatePickUnit dpu = new DatePickUnit();        public Form1()        {            InitializeComponent();        }        private void Form1_Load(object sender, EventArgs e)        {            string FormatString = "yyyy年M月d日 H:mm"; //y年，M月，d日，H24小时制,h12小时制,s秒            dateTimePicker1.CustomFormat = FormatString;            dateTimePicker2.CustomFormat = FormatString;            dateTimePicker1.Format = DateTimePickerFormat.Custom;            dateTimePicker2.Format = DateTimePickerFormat.Custom;            dpu.UniversalTimePicker = dateTimePicker1;            dpu.LocalTimePicker = dateTimePicker2;            dpu.TimeChange += new DatePickUnit.TimeChangeHandler(dpu_TimeChange);            dpu.ChangeTime(DateTime.Now,false);        }        void dpu_TimeChange(DateTimePicker UniversalTimePicker, DateTimePicker LocalTimePicker, DateTime TimeValue, bool IsUniversalTimeChanged)        {            if (IsUniversalTimeChanged)            {                LocalTimePicker.Value = TimeValue;            }            else            {                UniversalTimePicker.Value = TimeValue.ToUniversalTime();            }        }        private void dateTimePicker1_ValueChanged(object sender, EventArgs e)        {            dpu.ChangeTime(dateTimePicker1.Value.ToLocalTime(), true);        }        private void dateTimePicker2_ValueChanged(object sender, EventArgs e)        {            dpu.ChangeTime(dateTimePicker2.Value, false);        }        private void button1_Click(object sender, EventArgs e)        {            string strHours = textBox1.Text;            string strMinutes = textBox2.Text;            int hours = 0;            int minutes = 0;            hours = Convert(strHours,true);            minutes = Convert(strMinutes,false);            DateTime current = DateTime.Now;            current = current.AddHours(-1 * hours);            current = current.AddMinutes(-1 * minutes);            dpu.ChangeTime(current, false);            textBox1.Text = "";            textBox2.Text = "";        }        private int Convert(string strValue,bool IsHour)        {            int result = 0;            string strTitle = string.Empty;            try            {                if (strValue.Length > 0)                {                    result = int.Parse(strValue);                }            }            catch (Exception ex)            {                if (ex is FormatException)                {                    if (IsHour)                    {                        strTitle = "小时";                    }                    else                    {                        strTitle = "分钟";                    }                    MessageBox.Show(strTitle + "数字格式错误，请重新设定！", strTitle + "格式错误",MessageBoxButtons.OK,MessageBoxIcon.Error);                }            }            return result;        }    }    internal class DatePickUnit    {        public DateTimePicker UniversalTimePicker{set;get;}        public DateTimePicker LocalTimePicker{set;get;}        public delegate void TimeChangeHandler(DateTimePicker UniversalTimePicker,DateTimePicker LocalTimePicker,DateTime TimeValue,bool IsUniversalTimeChanged);        public event TimeChangeHandler TimeChange;        public void ChangeTime(DateTime time,bool IsUniversalTimeChanged)        {            TimeChange(UniversalTimePicker, LocalTimePicker, time,IsUniversalTimeChanged);        }    }}

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