如何通过格式将字符串转换为Datetime

Question

可能重复：
在c#中将字符串转换为DateTime

如何通过格式将字符串转换为DateTime？

Convert.ToDateTime("12/11/17 2:52:35 PM")

结果为12/11/2017 02:52:35 PM，这是不正确的，因为我的期望是11/17/2012 02:52:35 PM

Answer 1

您正在寻找DateTime.ParseExact()。

DateTime.ParseExact(myStr, "yy/MM/dd h:mm:ss tt", CultureInfo.InvariantCulture);

Answer 2

使用DateTime.ParseExact()方法。

将指定的日期和时间的字符串表示形式转换为其使用指定格式和特定于区域性的等效DateTime格式信息。字符串表示形式的格式必须匹配指定的格式。

   DateTime result = DateTime.ParseExact(yourdatestring, 
                                        "yy/MM/dd h:mm:ss tt",             
                                         CultureInfo.InvariantCulture);

Answer 3

最好使用DateTime.*Parse方法之一。

它们采用表示DateTime的字符串、格式字符串(或它们的数组(和一些其他参数。

自定义格式字符串将是yy/MM/dd h:mm:ss tt。

因此：

var date = DateTime.ParseExact("12/11/17 2:52:35 PM", 
                               "yy/MM/dd h:mm:ss tt"
                               CultureInfo.InvariantCulture);

Answer 4

您需要指定字符串的区域性：

// Date strings are interpreted according to the current culture. 
// If the culture is en-US, this is interpreted as "January 8, 2008",
// but if the user's computer is fr-FR, this is interpreted as "August 1, 2008" 
string date = "01/08/2008";
DateTime dt = Convert.ToDateTime(date);            
Console.WriteLine("Year: {0}, Month: {1}, Day: {2}", dt.Year, dt.Month, dt.Day);
// Specify exactly how to interpret the string.
IFormatProvider culture = new System.Globalization.CultureInfo("fr-FR", true);
// Alternate choice: If the string has been input by an end user, you might  
// want to format it according to the current culture: 
// IFormatProvider culture = System.Threading.Thread.CurrentThread.CurrentCulture;
DateTime dt2 = DateTime.Parse(date, culture, System.Globalization.DateTimeStyles.AssumeLocal);
Console.WriteLine("Year: {0}, Month: {1}, Day {2}", dt2.Year, dt2.Month, dt2.Day);
/* Output (assuming first culture is en-US and second is fr-FR):
    Year: 2008, Month: 1, Day: 8
    Year: 2008, Month: 8, Day 1
 */

Answer 5

试试这个

dateValue = DateTime.ParseExact(dateString,
                                "yy/MM/dd hh:mm:ss tt",
                                new CultureInfo("en-US"),
                                DateTimeStyles.None);

"tt"是AM/PM指示符。