我在跟随功能
中遇到String was not recognized as a valid DateTime.例外
public int GetTime()
{
string time = "17-07-2015 01:11:25"
time.Replace('-', '/');
DateTime oldDate = Convert.ToDateTime(time);
// Difference in days, hours, and minutes.
DateTime newDate =Convert.ToDateTime(DateTime.Now.ToString("dd-MM-yyyy HH:mm:ss"));
TimeSpan ts = oldDate - newDate;
// Difference in days.
int differenceInhours = ts.Hours;
differenceInhours = differenceInhours * 60;
int differenceInMinutes = ts.Minutes + 1;
int BalanceTime = differenceInhours + differenceInMinutes;
return BalanceTime;
}
17-07-2015 01:11:25此日期存储在数据库
答案 0 :(得分：2)
您可以尝试这样做，因为您知道日期时间的格式：
DateTime oldDate = DateTime.ParseExact(time,"dd-MM-yyyy HH:mm:ss", CultureInfo.InvariantCulture);
答案 1 :(得分：0)
在你的：
DateTime newDate =Convert.ToDateTime(DateTime.Now.ToString("dd-MM-yyyy HH:mm:ss"));
尝试改为：
DateTime newDate =Convert.ToDateTime(DateTime.Now.ToString("dd MM yyyy HH:mm:ss"));
答案 2 :(得分：0)
试试这个
const string time = "17-07-2015 01:11:25";
DateTime oldDate;
time.TryParseDateOrTime(DateTimeRoutines.DateTimeFormat.USA_DATE, out oldDate);
DateTime newDate = DateTime.Now;
TimeSpan ts = oldDate - newDate;
但您需要将以下类添加到项目中
DateTimeRoutines.cs
using System;
using System.Text.RegularExpressions;
/// <summary>
/// Miscellaneous and parsing methods for DateTime
/// </summary>
public static class DateTimeRoutines
{
#region miscellaneous methods
/// <summary>
/// Amount of seconds elapsed between 1970-01-01 00:00:00 and the date-time.
/// </summary>
/// <param name="date_time">date-time</param>
/// <returns>seconds</returns>
public static uint GetSecondsSinceUnixEpoch(this DateTime date_time)
{
TimeSpan t = date_time - new DateTime(1970, 1, 1);
int ss = (int)t.TotalSeconds;
if (ss < 0)
return 0;
return (uint)ss;
}
#endregion
#region parsing definitions
/// <summary>
/// Defines a substring where date-time was found and result of conversion
/// </summary>
public class ParsedDateTime
{
/// <summary>
/// Index of first char of a date substring found in the string
/// </summary>
readonly public int IndexOfDate = -1;
/// <summary>
/// Length a date substring found in the string
/// </summary>
readonly public int LengthOfDate = -1;
/// <summary>
/// Index of first char of a time substring found in the string
/// </summary>
readonly public int IndexOfTime = -1;
/// <summary>
/// Length of a time substring found in the string
/// </summary>
readonly public int LengthOfTime = -1;
/// <summary>
/// DateTime found in the string
/// </summary>
readonly public DateTime DateTime;
/// <summary>
/// True if a date was found within the string
/// </summary>
readonly public bool IsDateFound;
/// <summary>
/// True if a time was found within the string
/// </summary>
readonly public bool IsTimeFound;
/// <summary>
/// UTC offset if it was found within the string
/// </summary>
readonly public TimeSpan UtcOffset;
/// <summary>
/// True if UTC offset was found in the string
/// </summary>
readonly public bool IsUtcOffsetFound;
/// <summary>
/// Utc gotten from DateTime if IsUtcOffsetFound is True
/// </summary>
public DateTime UtcDateTime;
public ParsedDateTime(int index_of_date, int length_of_date, int index_of_time, int length_of_time, DateTime date_time)
{
IndexOfDate = index_of_date;
LengthOfDate = length_of_date;
IndexOfTime = index_of_time;
LengthOfTime = length_of_time;
DateTime = date_time;
IsDateFound = index_of_date > -1;
IsTimeFound = index_of_time > -1;
UtcOffset = new TimeSpan(25, 0, 0);
IsUtcOffsetFound = false;
UtcDateTime = new DateTime(1, 1, 1);
}
public ParsedDateTime(int index_of_date, int length_of_date, int index_of_time, int length_of_time, DateTime date_time, TimeSpan utc_offset)
{
IndexOfDate = index_of_date;
LengthOfDate = length_of_date;
IndexOfTime = index_of_time;
LengthOfTime = length_of_time;
DateTime = date_time;
IsDateFound = index_of_date > -1;
IsTimeFound = index_of_time > -1;
UtcOffset = utc_offset;
IsUtcOffsetFound = Math.Abs(utc_offset.TotalHours) < 12;
if (!IsUtcOffsetFound)
UtcDateTime = new DateTime(1, 1, 1);
else
{
if (index_of_date < 0)//to avoid negative date exception when date is undefined
{
TimeSpan ts = date_time.TimeOfDay + utc_offset;
if (ts < new TimeSpan(0))
UtcDateTime = new DateTime(1, 1, 2) + ts;
else
UtcDateTime = new DateTime(1, 1, 1) + ts;
}
else
UtcDateTime = date_time + utc_offset;
}
}
}
/// <summary>
/// Date that is accepted in the following cases:
/// - no date was parsed by TryParseDateOrTime();
/// - no year was found by TryParseDate();
/// It is ignored if DefaultDateIsNow = true was set after DefaultDate
/// </summary>
public static DateTime DefaultDate
{
set
{
_DefaultDate = value;
DefaultDateIsNow = false;
}
get
{
if (DefaultDateIsNow)
return DateTime.Now;
else
return _DefaultDate;
}
}
static DateTime _DefaultDate = DateTime.Now;
/// <summary>
/// If true then DefaultDate property is ignored and DefaultDate is always DateTime.Now
/// </summary>
public static bool DefaultDateIsNow = true;
/// <summary>
/// Defines default date-time format.
/// </summary>
public enum DateTimeFormat
{
/// <summary>
/// month number goes before day number
/// </summary>
USA_DATE,
/// <summary>
/// day number goes before month number
/// </summary>
UK_DATE,
///// <summary>
///// time is specifed through AM or PM
///// </summary>
//USA_TIME,
}
#endregion
#region parsing derived methods for DateTime output
/// <summary>
/// Tries to find date and time within the passed string and return it as DateTime structure.
/// </summary>
/// <param name="str">string that contains date and/or time</param>
/// <param name="default_format">format to be used preferably in ambivalent instances</param>
/// <param name="date_time">parsed date-time output</param>
/// <returns>true if both date and time were found, else false</returns>
static public bool TryParseDateTime(this string str, DateTimeFormat default_format, out DateTime date_time)
{
ParsedDateTime parsed_date_time;
if (!TryParseDateTime(str, default_format, out parsed_date_time))
{
date_time = new DateTime(1, 1, 1);
return false;
}
date_time = parsed_date_time.DateTime;
return true;
}
/// <summary>
/// Tries to find date and/or time within the passed string and return it as DateTime structure.
/// If only date was found, time in the returned DateTime is always 0:0:0.
/// If only time was found, date in the returned DateTime is DefaultDate.
/// </summary>
/// <param name="str">string that contains date and(or) time</param>
/// <param name="default_format">format to be used preferably in ambivalent instances</param>
/// <param name="date_time">parsed date-time output</param>
/// <returns>true if date and/or time was found, else false</returns>
static public bool TryParseDateOrTime(this string str, DateTimeFormat default_format, out DateTime date_time)
{
ParsedDateTime parsed_date_time;
if (!TryParseDateOrTime(str, default_format, out parsed_date_time))
{
date_time = new DateTime(1, 1, 1);
return false;
}
date_time = parsed_date_time.DateTime;
return true;
}
/// <summary>
/// Tries to find time within the passed string and return it as DateTime structure.
/// It recognizes only time while ignoring date, so date in the returned DateTime is always 1/1/1.
/// </summary>
/// <param name="str">string that contains time</param>
/// <param name="default_format">format to be used preferably in ambivalent instances</param>
/// <param name="time">parsed time output</param>
/// <returns>true if time was found, else false</returns>
public static bool TryParseTime(this string str, DateTimeFormat default_format, out DateTime time)
{
ParsedDateTime parsed_time;
if (!TryParseTime(str, default_format, out parsed_time, null))
{
time = new DateTime(1, 1, 1);
return false;
}
time = parsed_time.DateTime;
return true;
}
/// <summary>
/// Tries to find date within the passed string and return it as DateTime structure.
/// It recognizes only date while ignoring time, so time in the returned DateTime is always 0:0:0.
/// If year of the date was not found then it accepts the current year.
/// </summary>
/// <param name="str">string that contains date</param>
/// <param name="default_format">format to be used preferably in ambivalent instances</param>
/// <param name="date">parsed date output</param>
/// <returns>true if date was found, else false</returns>
static public bool TryParseDate(this string str, DateTimeFormat default_format, out DateTime date)
{
ParsedDateTime parsed_date;
if (!TryParseDate(str, default_format, out parsed_date))
{
date = new DateTime(1, 1, 1);
return false;
}
date = parsed_date.DateTime;
return true;
}
#endregion
#region parsing derived methods for ParsedDateTime output
/// <summary>
/// Tries to find date and time within the passed string and return it as ParsedDateTime object.
/// </summary>
/// <param name="str">string that contains date-time</param>
/// <param name="default_format">format to be used preferably in ambivalent instances</param>
/// <param name="parsed_date_time">parsed date-time output</param>
/// <returns>true if both date and time were found, else false</returns>
static public bool TryParseDateTime(this string str, DateTimeFormat default_format, out ParsedDateTime parsed_date_time)
{
if (DateTimeRoutines.TryParseDateOrTime(str, default_format, out parsed_date_time)
&& parsed_date_time.IsDateFound
&& parsed_date_time.IsTimeFound
)
return true;
parsed_date_time = null;
return false;
}
/// <summary>
/// Tries to find time within the passed string and return it as ParsedDateTime object.
/// It recognizes only time while ignoring date, so date in the returned ParsedDateTime is always 1/1/1
/// </summary>
/// <param name="str">string that contains date-time</param>
/// <param name="default_format">format to be used preferably in ambivalent instances</param>
/// <param name="parsed_time">parsed date-time output</param>
/// <returns>true if time was found, else false</returns>
static public bool TryParseTime(this string str, DateTimeFormat default_format, out ParsedDateTime parsed_time)
{
return TryParseTime(str, default_format, out parsed_time, null);
}
/// <summary>
/// Tries to find date and/or time within the passed string and return it as ParsedDateTime object.
/// If only date was found, time in the returned ParsedDateTime is always 0:0:0.
/// If only time was found, date in the returned ParsedDateTime is DefaultDate.
/// </summary>
/// <param name="str">string that contains date-time</param>
/// <param name="default_format">format to be used preferably in ambivalent instances</param>
/// <param name="parsed_date_time">parsed date-time output</param>
/// <returns>true if date or time was found, else false</returns>
static public bool TryParseDateOrTime(this string str, DateTimeFormat default_format, out ParsedDateTime parsed_date_time)
{
parsed_date_time = null;
ParsedDateTime parsed_date;
ParsedDateTime parsed_time;
if (!TryParseDate(str, default_format, out parsed_date))
{
if (!TryParseTime(str, default_format, out parsed_time, null))
return false;
DateTime date_time = new DateTime(DefaultDate.Year, DefaultDate.Month, DefaultDate.Day, parsed_time.DateTime.Hour, parsed_time.DateTime.Minute, parsed_time.DateTime.Second);
parsed_date_time = new ParsedDateTime(-1, -1, parsed_time.IndexOfTime, parsed_time.LengthOfTime, date_time, parsed_time.UtcOffset);
}
else
{
if (!TryParseTime(str, default_format, out parsed_time, parsed_date))
{
DateTime date_time = new DateTime(parsed_date.DateTime.Year, parsed_date.DateTime.Month, parsed_date.DateTime.Day, 0, 0, 0);
parsed_date_time = new ParsedDateTime(parsed_date.IndexOfDate, parsed_date.LengthOfDate, -1, -1, date_time);
}
else
{
DateTime date_time = new DateTime(parsed_date.DateTime.Year, parsed_date.DateTime.Month, parsed_date.DateTime.Day, parsed_time.DateTime.Hour, parsed_time.DateTime.Minute, parsed_time.DateTime.Second);
parsed_date_time = new ParsedDateTime(parsed_date.IndexOfDate, parsed_date.LengthOfDate, parsed_time.IndexOfTime, parsed_time.LengthOfTime, date_time, parsed_time.UtcOffset);
}
}
return true;
}
#endregion
#region parsing base methods
/// <summary>
/// Tries to find time within the passed string (relatively to the passed parsed_date if any) and return it as ParsedDateTime object.
/// It recognizes only time while ignoring date, so date in the returned ParsedDateTime is always 1/1/1
/// </summary>
/// <param name="str">string that contains date</param>
/// <param name="default_format">format to be used preferably in ambivalent instances</param>
/// <param name="parsed_time">parsed date-time output</param>
/// <param name="parsed_date">ParsedDateTime object if the date was found within this string, else NULL</param>
/// <returns>true if time was found, else false</returns>
public static bool TryParseTime(this string str, DateTimeFormat default_format, out ParsedDateTime parsed_time, ParsedDateTime parsed_date)
{
parsed_time = null;
string time_zone_r;
if (default_format == DateTimeFormat.USA_DATE)
time_zone_r = @"(?:\s*(?'time_zone'UTC|GMT|CST|EST))?";
else
time_zone_r = @"(?:\s*(?'time_zone'UTC|GMT))?";
Match m;
if (parsed_date != null && parsed_date.IndexOfDate > -1)
{//look around the found date
//look for <date> hh:mm:ss <UTC offset>
m = Regex.Match(str.Substring(parsed_date.IndexOfDate + parsed_date.LengthOfDate), @"(?<=^\s*,?\s+|^\s*at\s*|^\s*[T\-]\s*)(?'hour'\d{2})\s*:\s*(?'minute'\d{2})\s*:\s*(?'second'\d{2})\s+(?'offset_sign'[\+\-])(?'offset_hh'\d{2}):?(?'offset_mm'\d{2})(?=$|[^\d\w])", RegexOptions.Compiled);
if (!m.Success)
//look for <date> [h]h:mm[:ss] [PM/AM] [UTC/GMT]
m = Regex.Match(str.Substring(parsed_date.IndexOfDate + parsed_date.LengthOfDate), @"(?<=^\s*,?\s+|^\s*at\s*|^\s*[T\-]\s*)(?'hour'\d{1,2})\s*:\s*(?'minute'\d{2})\s*(?::\s*(?'second'\d{2}))?(?:\s*(?'ampm'AM|am|PM|pm))?" + time_zone_r + @"(?=$|[^\d\w])", RegexOptions.Compiled);
if (!m.Success)
//look for [h]h:mm:ss [PM/AM] [UTC/GMT] <date>
m = Regex.Match(str.Substring(0, parsed_date.IndexOfDate), @"(?<=^|[^\d])(?'hour'\d{1,2})\s*:\s*(?'minute'\d{2})\s*(?::\s*(?'second'\d{2}))?(?:\s*(?'ampm'AM|am|PM|pm))?" + time_zone_r + @"(?=$|[\s,]+)", RegexOptions.Compiled);
if (!m.Success)
//look for [h]h:mm:ss [PM/AM] [UTC/GMT] within <date>
m = Regex.Match(str.Substring(parsed_date.IndexOfDate, parsed_date.LengthOfDate), @"(?<=^|[^\d])(?'hour'\d{1,2})\s*:\s*(?'minute'\d{2})\s*(?::\s*(?'second'\d{2}))?(?:\s*(?'ampm'AM|am|PM|pm))?" + time_zone_r + @"(?=$|[\s,]+)", RegexOptions.Compiled);
}
else//look anywhere within string
{
//look for hh:mm:ss <UTC offset>
m = Regex.Match(str, @"(?<=^|\s+|\s*T\s*)(?'hour'\d{2})\s*:\s*(?'minute'\d{2})\s*:\s*(?'second'\d{2})\s+(?'offset_sign'[\+\-])(?'offset_hh'\d{2}):?(?'offset_mm'\d{2})?(?=$|[^\d\w])", RegexOptions.Compiled);
if (!m.Success)
//look for [h]h:mm[:ss] [PM/AM] [UTC/GMT]
m = Regex.Match(str, @"(?<=^|\s+|\s*T\s*)(?'hour'\d{1,2})\s*:\s*(?'minute'\d{2})\s*(?::\s*(?'second'\d{2}))?(?:\s*(?'ampm'AM|am|PM|pm))?" + time_zone_r + @"(?=$|[^\d\w])", RegexOptions.Compiled);
}
if (!m.Success)
return false;
//try
//{
int hour = int.Parse(m.Groups["hour"].Value);
if (hour < 0 || hour > 23)
return false;
int minute = int.Parse(m.Groups["minute"].Value);
if (minute < 0 || minute > 59)
return false;
int second = 0;
if (!string.IsNullOrEmpty(m.Groups["second"].Value))
{
second = int.Parse(m.Groups["second"].Value);
if (second < 0 || second > 59)
return false;
}
if (string.Compare(m.Groups["ampm"].Value, "PM", true) == 0 && hour < 12)
hour += 12;
else if (string.Compare(m.Groups["ampm"].Value, "AM", true) == 0 && hour == 12)
hour -= 12;
DateTime date_time = new DateTime(1, 1, 1, hour, minute, second);
if (m.Groups["offset_hh"].Success)
{
int offset_hh = int.Parse(m.Groups["offset_hh"].Value);
int offset_mm = 0;
if (m.Groups["offset_mm"].Success)
offset_mm = int.Parse(m.Groups["offset_mm"].Value);
TimeSpan utc_offset = new TimeSpan(offset_hh, offset_mm, 0);
if (m.Groups["offset_sign"].Value == "-")
utc_offset = -utc_offset;
parsed_time = new ParsedDateTime(-1, -1, m.Index, m.Length, date_time, utc_offset);
return true;
}
if (m.Groups["time_zone"].Success)
{
TimeSpan utc_offset;
switch (m.Groups["time_zone"].Value)
{
case "UTC":
case "GMT":
utc_offset = new TimeSpan(0, 0, 0);
break;
case "CST":
utc_offset = new TimeSpan(-6, 0, 0);
break;
case "EST":
utc_offset = new TimeSpan(-5, 0, 0);
break;
default:
throw new Exception("Time zone: " + m.Groups["time_zone"].Value + " is not defined.");
}
parsed_time = new ParsedDateTime(-1, -1, m.Index, m.Length, date_time, utc_offset);
return true;
}
parsed_time = new ParsedDateTime(-1, -1, m.Index, m.Length, date_time);
//}
//catch(Exception e)
//{
// return false;
//}
return true;
}
/// <summary>
/// Tries to find date within the passed string and return it as ParsedDateTime object.
/// It recognizes only date while ignoring time, so time in the returned ParsedDateTime is always 0:0:0.
/// If year of the date was not found then it accepts the current year.
/// </summary>
/// <param name="str">string that contains date</param>
/// <param name="default_format">format to be used preferably in ambivalent instances</param>
/// <param name="parsed_date">parsed date output</param>
/// <returns>true if date was found, else false</returns>
static public bool TryParseDate(this string str, DateTimeFormat default_format, out ParsedDateTime parsed_date)
{
parsed_date = null;
if (string.IsNullOrEmpty(str))
return false;
//look for dd/mm/yy
Match m = Regex.Match(str, @"(?<=^|[^\d])(?'day'\d{1,2})\s*(?'separator'[\\/\.])+\s*(?'month'\d{1,2})\s*\'separator'+\s*(?'year'\d{2}|\d{4})(?=$|[^\d])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
if (m.Success)
{
DateTime date;
if ((default_format ^ DateTimeFormat.USA_DATE) == DateTimeFormat.USA_DATE)
{
if (!convert_to_date(int.Parse(m.Groups["year"].Value), int.Parse(m.Groups["day"].Value), int.Parse(m.Groups["month"].Value), out date))
return false;
}
else
{
if (!convert_to_date(int.Parse(m.Groups["year"].Value), int.Parse(m.Groups["month"].Value), int.Parse(m.Groups["day"].Value), out date))
return false;
}
parsed_date = new ParsedDateTime(m.Index, m.Length, -1, -1, date);
return true;
}
//look for [yy]yy-mm-dd
m = Regex.Match(str, @"(?<=^|[^\d])(?'year'\d{2}|\d{4})\s*(?'separator'[\-])\s*(?'month'\d{1,2})\s*\'separator'+\s*(?'day'\d{1,2})(?=$|[^\d])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
if (m.Success)
{
DateTime date;
if (!convert_to_date(int.Parse(m.Groups["year"].Value), int.Parse(m.Groups["month"].Value), int.Parse(m.Groups["day"].Value), out date))
return false;
parsed_date = new ParsedDateTime(m.Index, m.Length, -1, -1, date);
return true;
}
//look for month dd yyyy
m = Regex.Match(str, @"(?:^|[^\d\w])(?'month'Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[uarychilestmbro]*\s+(?'day'\d{1,2})(?:-?st|-?th|-?rd|-?nd)?\s*,?\s*(?'year'\d{4})(?=$|[^\d\w])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
if (!m.Success)
//look for dd month [yy]yy
m = Regex.Match(str, @"(?:^|[^\d\w:])(?'day'\d{1,2})(?:-?st\s+|-?th\s+|-?rd\s+|-?nd\s+|-|\s+)(?'month'Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[uarychilestmbro]*(?:\s*,?\s*|-)'?(?'year'\d{2}|\d{4})(?=$|[^\d\w])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
if (!m.Success)
//look for yyyy month dd
m = Regex.Match(str, @"(?:^|[^\d\w])(?'year'\d{4})\s+(?'month'Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[uarychilestmbro]*\s+(?'day'\d{1,2})(?:-?st|-?th|-?rd|-?nd)?(?=$|[^\d\w])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
if (!m.Success)
//look for month dd hh:mm:ss MDT|UTC yyyy
m = Regex.Match(str, @"(?:^|[^\d\w])(?'month'Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[uarychilestmbro]*\s+(?'day'\d{1,2})\s+\d{2}\:\d{2}\:\d{2}\s+(?:MDT|UTC)\s+(?'year'\d{4})(?=$|[^\d\w])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
if (!m.Success)
//look for month dd [yyyy]
m = Regex.Match(str, @"(?:^|[^\d\w])(?'month'Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[uarychilestmbro]*\s+(?'day'\d{1,2})(?:-?st|-?th|-?rd|-?nd)?(?:\s*,?\s*(?'year'\d{4}))?(?=$|[^\d\w])", RegexOptions.Compiled | RegexOptions.IgnoreCase);
if (m.Success)
{
int month = -1;
int index_of_date = m.Index;
int length_of_date = m.Length;
switch (m.Groups["month"].Value)
{
case "Jan":
case "JAN":
month = 1;
break;
case "Feb":
case "FEB":
month = 2;
break;
case "Mar":
case "MAR":
month = 3;
break;
case "Apr":
case "APR":
month = 4;
break;
case "May":
case "MAY":
month = 5;
break;
case "Jun":
case "JUN":
month = 6;
break;
case "Jul":
month = 7;
break;
case "Aug":
case "AUG":
month = 8;
break;
case "Sep":
case "SEP":
month = 9;
break;
case "Oct":
case "OCT":
month = 10;
break;
case "Nov":
case "NOV":
month = 11;
break;
case "Dec":
case "DEC":
month = 12;
break;
}
int year;
if (!string.IsNullOrEmpty(m.Groups["year"].Value))
year = int.Parse(m.Groups["year"].Value);
else
year = DefaultDate.Year;
DateTime date;
if (!convert_to_date(year, month, int.Parse(m.Groups["day"].Value), out date))
return false;
parsed_date = new ParsedDateTime(index_of_date, length_of_date, -1, -1, date);
return true;
}
return false;
}
static bool convert_to_date(int year, int month, int day, out DateTime date)
{
if (year >= 100)
{
if (year < 1000)
{
date = new DateTime(1, 1, 1);
return false;
}
}
else
if (year > 30)
year += 1900;
else
year += 2000;
try
{
date = new DateTime(year, month, day);
}
catch
{
date = new DateTime(1, 1, 1);
return false;
}
return true;
}
#endregion
}
编辑：
您还可以创建extion方法ToDateTime()为
public static class Extensions
{
public static DateTime ToDateTime(this string dateValue, DateTimeRoutines.DateTimeFormat dateFormat = DateTimeRoutines.DateTimeFormat.USA_DATE)
{
DateTime date;
dateValue.TryParseDateOrTime(dateFormat, out date);
return date;
}
}
现在将其视为
const string time = "17-07-2015 01:11:25";
DateTime oldDate = time.ToDateTime();
答案 3 :(得分：0)
在您的代码中，您传递time代表DD/MM/YYYY格式的日期。
默认情况下，.NET使用en-US区域性，根据日期为MM/DD/YYYY格式。因此，当使用ToDateTime（）方法时，它会抛出错误说
String was not recognized as a valid DateTime。
要避免此错误，您可以使用以下方法
DateTime myDate = Convert.ToDateTime(time,@"d/M/yyyy HH:mm:ss", System.Globalization.CultureInfo.GetCultureInfo("hi-IN").DateTimeFormat);
或者
DateTime myDate = DateTime.ParseExact(time,@"d/M/yyyy HH:mm:ss", CultureInfo.InvariantCulture);