美国东部时间和北京时间之间的转换代码,CSharp代码库,德仔网

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【CSharp】美国东部时间和北京时间之间的转换
作者:玉开 / 发布于2011/5/31/ 678
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            <td class="content">"csharp color1"><font color="#808080">/// <summary> </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// AMESTime 的摘要说明: </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// 美东时间的转换 </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// 美东时间在UTC-5时区，美国有夏时制，即在夏令时启用之后美东时间比起所在时区早一个小时，即UTC-4 </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// 在未使用夏令时时美东时间比北京时间（UTC+8时区）晚13个小时，在启用夏令时时美东时间比北京时间晚12个小时 </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// 美国国会2005年通过的能源法案，夏令时时段：从2007年开始每年3月的第二个星期日开始夏令时，结束日期为11月的第一个星期日。 </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// </summary> </font></td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">public</font></strong> "csharp keyword"><strong><font color="#006699">class</font></strong> "csharp plain">AMESTime </td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">private</font></strong> "csharp keyword"><strong><font color="#006699">static</font></strong> "csharp plain">DateTime _thisYearDaylightSavingTimeStart, </td>
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            <td class="content">"csharp plain">_thisYearDaylightSavingTimeEnd; </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">private</font></strong> "csharp keyword"><strong><font color="#006699">const</font></strong> "csharp keyword"><strong><font color="#006699">int</font></strong> "csharp plain">TIMEZONE_OFFSET_DAY_SAVING_LIGHT = -12; </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">private</font></strong> "csharp keyword"><strong><font color="#006699">const</font></strong> "csharp keyword"><strong><font color="#006699">int</font></strong> "csharp plain">TIMEZONE_OFFSET = -13; </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">public</font></strong> "csharp keyword"><strong><font color="#006699">static</font></strong> "csharp plain">DateTime BeijingTimeToAMESTime(DateTime beijingTime) </td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">int</font></strong> "csharp plain">offsetHours = (IsNowAMESDayLightSavingTime ? TIMEZONE_OFFSET_DAY_SAVING_LIGHT:TIMEZONE_OFFSET); </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">return</font></strong> "csharp plain">beijingTime.AddHours(offsetHours); </td>
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            <td class="content">"csharp plain">} </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">public</font></strong> "csharp keyword"><strong><font color="#006699">static</font></strong> "csharp plain">DateTime AMESNow </td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">get</font></strong></td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">return</font></strong> "csharp plain">BeijingTimeToAMESTime(DateTime.Now); </td>
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            <td class="content">"csharp plain">} </td>
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            <td class="content">"csharp plain">} </td>
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            <td class="content">"csharp color1"><font color="#808080">/// <summary> </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// 判断当前日期是否是美国夏令时 </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// 从2007年开始每年3月的第二个星期日开始夏令时，结束日期为11月的第一个星期日。 </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// </summary> </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// <returns>是，返回true，否则为false</returns> </font></td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">public</font></strong> "csharp keyword"><strong><font color="#006699">static</font></strong> "csharp keyword"><strong><font color="#006699">bool</font></strong> "csharp plain">IsNowAMESDayLightSavingTime </td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">get</font></strong></td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">return</font></strong> "csharp plain">DateTime.UtcNow > DayLightSavingStartTimeUtc </td>
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            <td class="content">"csharp plain">&& DateTime.UtcNow < DayLightSavingEndTimeUtc; </td>
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            <td class="content">"csharp plain">} </td>
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            <td class="content">"csharp plain">} </td>
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            <td class="content">"csharp color1"><font color="#808080">/// <summary> </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// 夏令时开始时间 </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// </summary> </font></td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">static</font></strong> "csharp plain">DateTime DayLightSavingStartTimeUtc </td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">get</font></strong></td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">if</font></strong>"csharp plain">(_thisYearDaylightSavingTimeStart.Year != DateTime.Now.Year) </td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp plain">DateTime temp = "csharp keyword"><strong><font color="#006699">new</font></strong> "csharp plain">DateTime(DateTime.Now.Year,3,8,0,0,0); </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">while</font></strong>"csharp plain">(temp.DayOfWeek != DayOfWeek.Sunday) </td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp plain">temp = temp.AddDays(1); </td>
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            <td class="content">"csharp plain">} </td>
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            <td class="content">"csharp plain">_thisYearDaylightSavingTimeStart = temp.AddHours(TIMEZONE_OFFSET); </td>
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            <td class="content">"csharp plain">} </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">return</font></strong> "csharp plain">_thisYearDaylightSavingTimeStart; </td>
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            <td class="content">"csharp plain">} </td>
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            <td class="content">"csharp plain">} </td>
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            <td class="content">"csharp color1"><font color="#808080">/// <summary> </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// 夏令时结束时间 </font></td>
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            <td class="content">"csharp color1"><font color="#808080">/// </summary> </font></td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">static</font></strong> "csharp plain">DateTime DayLightSavingEndTimeUtc </td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">get</font></strong></td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">if</font></strong>"csharp plain">(_thisYearDaylightSavingTimeEnd.Year != DateTime.Now.Year) </td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp plain">DateTime temp = "csharp keyword"><strong><font color="#006699">new</font></strong> "csharp plain">DateTime(DateTime.Now.Year,11,1,0,0,0); </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">while</font></strong>"csharp plain">(temp.DayOfWeek != DayOfWeek.Sunday) </td>
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            <td class="content">"csharp plain">{ </td>
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            <td class="content">"csharp plain">temp = temp.AddDays(1); </td>
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            <td class="content">"csharp plain">} </td>
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            <td class="content">"csharp plain">_thisYearDaylightSavingTimeEnd = temp.AddHours(TIMEZONE_OFFSET_DAY_SAVING_LIGHT); </td>
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            <td class="content">"csharp plain">} </td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">return</font></strong> "csharp plain">_thisYearDaylightSavingTimeEnd; </td>
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            <td class="content">"csharp plain">} </td>
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            <td class="content">"csharp plain">}</td>
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