C#本地时间和GMT(UTC)时间的转换

1 /// <summary>  
2 /// 本地时间转成GMT时间 3 /// </summary> 4 public static string ToGMTString(DateTime dt) 5  { 6 return dt.ToUniversalTime().ToString("r"); 7 } 

string s = ToGMTString(DateTime.Now);
//本地时间为：2016-6-30 10:04:39
//转换后的时间为：Thu, 30 Jun 2016 2:04:39 GMT

1 /// <summary>  
2 /// 本地时间转成GMT格式的时间 3 /// </summary> 4 public static string ToGMTFormat(DateTime dt) 5 { 6 return dt.ToString("r") + dt.ToString("zzz").Replace(":", ""); 7 }

string s = ToGMTFormat(DateTime.Now);
//本地时间为：2016-6-30 10:04:39
//转换后的时间为：Thu, 30 Jun 2016 10:04:39 GMT+0800

 1 /// <summary>  
 2 /// GMT时间转成本地时间  3 /// </summary>  4 /// <param name="gmt">字符串形式的GMT时间</param>  5 /// <returns></returns>  6 public static DateTime GMT2Local(string gmt)  7 {  8 DateTime dt = DateTime.MinValue;  9 try 10  { 11 string pattern = ""; 12 if (gmt.IndexOf("+0") != -1) 13  { 14 gmt = gmt.Replace("GMT", ""); 15 pattern = "ddd, dd MMM yyyy HH':'mm':'ss zzz"; 16  } 17 if (gmt.ToUpper().IndexOf("GMT") != -1) 18  { 19 pattern = "ddd, dd MMM yyyy HH':'mm':'ss 'GMT'"; 20  } 21 if (pattern != "") 22  { 23 dt = DateTime.ParseExact(gmt, pattern, System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.AdjustToUniversal); 24 dt = dt.ToLocalTime(); 25  } 26 else 27  { 28 dt = Convert.ToDateTime(gmt); 29  } 30  } 31 catch 32  { 33  } 34 return dt; 35 }

DateTime dt1 = GMT2Local("Thu, 30 Jun 2016 02:04:39 GMT"); 
//转换后的dt1为：2016-6-30 10:04:39
DateTime dt2 = GMT2Local("Thu, 30 Jun 2016 10:04:39 GMT+0800");
//转换后的dt2为：2016-6-30 10:04:39

1 /// <summary>  
2 /// 本地时间转成GMT时间 3 /// </summary> 4 public static string ToGMTString(DateTime dt) 5  { 6 return dt.ToUniversalTime().ToString("r"); 7 } 

string s = ToGMTString(DateTime.Now);
//本地时间为：2016-6-30 10:04:39
//转换后的时间为：Thu, 30 Jun 2016 2:04:39 GMT

1 /// <summary>  
2 /// 本地时间转成GMT格式的时间 3 /// </summary> 4 public static string ToGMTFormat(DateTime dt) 5 { 6 return dt.ToString("r") + dt.ToString("zzz").Replace(":", ""); 7 }

string s = ToGMTFormat(DateTime.Now);
//本地时间为：2016-6-30 10:04:39
//转换后的时间为：Thu, 30 Jun 2016 10:04:39 GMT+0800

 1 /// <summary>  
 2 /// GMT时间转成本地时间  3 /// </summary>  4 /// <param name="gmt">字符串形式的GMT时间</param>  5 /// <returns></returns>  6 public static DateTime GMT2Local(string gmt)  7 {  8 DateTime dt = DateTime.MinValue;  9 try 10  { 11 string pattern = ""; 12 if (gmt.IndexOf("+0") != -1) 13  { 14 gmt = gmt.Replace("GMT", ""); 15 pattern = "ddd, dd MMM yyyy HH':'mm':'ss zzz"; 16  } 17 if (gmt.ToUpper().IndexOf("GMT") != -1) 18  { 19 pattern = "ddd, dd MMM yyyy HH':'mm':'ss 'GMT'"; 20  } 21 if (pattern != "") 22  { 23 dt = DateTime.ParseExact(gmt, pattern, System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.AdjustToUniversal); 24 dt = dt.ToLocalTime(); 25  } 26 else 27  { 28 dt = Convert.ToDateTime(gmt); 29  } 30  } 31 catch 32  { 33  } 34 return dt; 35 }

DateTime dt1 = GMT2Local("Thu, 30 Jun 2016 02:04:39 GMT"); 
//转换后的dt1为：2016-6-30 10:04:39
DateTime dt2 = GMT2Local("Thu, 30 Jun 2016 10:04:39 GMT+0800");
//转换后的dt2为：2016-6-30 10:04:39