/// <summary>
/// Converts a
/// <see cref="T:System.DateTime"/>
/// object into a String the represents the elapsed time
/// relatively to the present.
/// </summary>
/// <param name="value">The given date and time.</param>
/// <param name="targetType">
/// The type corresponding to the binding property, which must be of
/// <see cref="T:System.String"/>.
/// </param>
/// <param name="parameter">(Not used).</param>
/// <param name="culture">
/// The culture to use in the converter.
/// When not specified, the converter uses the current culture
/// as specified by the system locale.
/// </param>
/// <returns>The given date and time as a String.</returns>
public Object Convert(Object value, Type targetType, Object parameter, String language)
{
var timeStamp = (Int32)value;
var unixDateTime = new DateTime(1970, 1, 1, 0, 0, 0);
unixDateTime = unixDateTime.AddSeconds(timeStamp);
unixDateTime = unixDateTime.ToLocalTime();
// Target value must be a System.DateTime object.
//if (!(value is DateTime))
//{
// throw new ArgumentException("Invalid type. Argument must be of the type System.DateTime.");
//}
SetLocalizationCulture();
String result;
DateTime given = unixDateTime;
DateTime current = DateTime.Now;
TimeSpan difference = current - given;
if (DateTimeFormatHelper.IsFutureDateTime(current, given))
{
// Future dates and times are not supported, but to prevent crashing an app
// if the time they receive from a server is slightly ahead of the phone's clock
// we'll just default to the minimum, which is "2 seconds ago".
result = GetPluralTimeUnits(2, PluralSecondStrings);
}
if (difference.TotalSeconds > Year)
{
// "over a year ago"
result = "一年多前";
}
else if (difference.TotalSeconds > (1.5 * Month))
{
// "x months ago"
Int32 nMonths = (Int32)((difference.TotalSeconds + Month / 2) / Month);
result = GetPluralMonth(nMonths);
}
else if (difference.TotalSeconds >= (3.5 * Week))
{
// "about a month ago"
result = "约 1 个月前";
}
else if (difference.TotalSeconds >= Week)
{
Int32 nWeeks = (Int32)(difference.TotalSeconds / Week);
if (nWeeks > 1)
{
// "x weeks ago"
result = String.Format(CultureInfo.CurrentUICulture, "{0} 周前", nWeeks.ToString());
}
else
{
// "about a week ago"
result = "约 1 周前";
}
}
else if (difference.TotalSeconds >= (5 * Day))
{
// "last <dayofweek>"
result = GetLastDayOfWeek(given.DayOfWeek);
}
else if (difference.TotalSeconds >= Day)
{
// "on <dayofweek>"
result = GetOnDayOfWeek(given.DayOfWeek);
}
else if (difference.TotalSeconds >= (2 * Hour))
{
// "x hours ago"
Int32 nHours = (Int32)(difference.TotalSeconds / Hour);
result = GetPluralTimeUnits(nHours, PluralHourStrings);
}
else if (difference.TotalSeconds >= Hour)
{
// "about an hour ago"
result = "约 1 小时前";
}
else if (difference.TotalSeconds >= (2 * Minute))
{
// "x minutes ago"
Int32 nMinutes = (Int32)(difference.TotalSeconds / Minute);
result = GetPluralTimeUnits(nMinutes, PluralMinuteStrings);
}
else if (difference.TotalSeconds >= Minute)
{
// "about a minute ago"
result = "约 1 分钟前";
}
else
{
// "x seconds ago" or default to "2 seconds ago" if less than two seconds.
Int32 nSeconds = ((Int32)difference.TotalSeconds > 1.0) ? (Int32)difference.TotalSeconds : 2;
result = GetPluralTimeUnits(nSeconds, PluralSecondStrings);
}
return(result);
}
public object Convert(object value, Type targetType, object parameter, string language)
{
PluralHourStrings = new string[4] {
XHoursAgo_2To4, XHoursAgo_EndsIn1Not11, XHoursAgo_EndsIn2To4Not12To14, XHoursAgo_Other
};
PluralMinuteStrings = new string[4] {
XMinutesAgo_2To4, XMinutesAgo_EndsIn1Not11, XMinutesAgo_EndsIn2To4Not12To14, XMinutesAgo_Other
};
PluralSecondStrings = new string[4] {
XSecondsAgo_2To4, XSecondsAgo_EndsIn1Not11, XSecondsAgo_EndsIn2To4Not12To14, XSecondsAgo_Other
};
string result;
DateTime given;
DateTime.TryParse((string)value, out given);
given = given.ToLocalTime();
DateTime current = DateTime.Now;
TimeSpan difference = current - given;
if (DateTimeFormatHelper.IsFutureDateTime(current, given))
{
// Future dates and times are not supported, but to prevent crashing an app
// if the time they receive from a server is slightly ahead of the phone's clock
// we'll just default to the minimum, which is "2 seconds ago".
result = GetPluralTimeUnits(2, PluralSecondStrings);
}
if (difference.TotalSeconds > Year)
{
// "over a year ago"
result = "over a year ago";
}
else if (difference.TotalSeconds > (1.5 * Month))
{
// "x months ago"
int nMonths = (int)((difference.TotalSeconds + Month / 2) / Month);
result = GetPluralMonth(nMonths);
}
else if (difference.TotalSeconds >= (3.5 * Week))
{
// "about a month ago"
result = "about a month ago";
}
else if (difference.TotalSeconds >= Week)
{
int nWeeks = (int)(difference.TotalSeconds / Week);
if (nWeeks > 1)
{
// "x weeks ago"
result = string.Format(XWeeksAgo_2To4, nWeeks.ToString());
}
else
{
// "about a week ago"
result = "about a week ago";
}
}
else if (difference.TotalSeconds >= (5 * Day))
{
// "last <dayofweek>"
result = GetLastDayOfWeek(given.DayOfWeek);
}
else if (difference.TotalSeconds >= Day)
{
// "on <dayofweek>"
result = GetOnDayOfWeek(given.DayOfWeek);
}
else if (difference.TotalSeconds >= (2 * Hour))
{
// "x hours ago"
int nHours = (int)(difference.TotalSeconds / Hour);
result = GetPluralTimeUnits(nHours, PluralHourStrings);
}
else if (difference.TotalSeconds >= Hour)
{
// "about an hour ago"
result = "about an hour ago";
}
else if (difference.TotalSeconds >= (2 * Minute))
{
// "x minutes ago"
int nMinutes = (int)(difference.TotalSeconds / Minute);
result = GetPluralTimeUnits(nMinutes, PluralMinuteStrings);
}
else if (difference.TotalSeconds >= Minute)
{
// "about a minute ago"
result = "about a minute ago";
}
else
{
// "x seconds ago" or default to "2 seconds ago" if less than two seconds.
int nSeconds = ((int)difference.TotalSeconds > 1.0) ? (int)difference.TotalSeconds : 2;
result = GetPluralTimeUnits(nSeconds, PluralSecondStrings);
}
return(result);
}