public static DateTime Add(this DateTime date, DurationStruct duration)
{
return(date
.AddYears(duration.Years)
.AddMonths(duration.Months)
.AddDays(duration.Days)
.AddHours(duration.Hours)
.AddMinutes(duration.Minutes)
.AddSeconds(duration.Seconds));
}
private string GetPatternFromDurationStruct(DurationStruct durationStruct)
{
string pattern = Constants.TAG_PERIOD;
if (durationStruct.Seconds >= Constants.SECONDS_PER_MINUTE)
{
int seconds = durationStruct.Seconds / Constants.SECONDS_PER_MINUTE;
durationStruct.Minutes += seconds;
durationStruct.Seconds -= seconds * Constants.SECONDS_PER_MINUTE;
}
if (durationStruct.Minutes >= Constants.MINUTES_PER_HOUR)
{
int hours = durationStruct.Minutes / Constants.MINUTES_PER_HOUR;
durationStruct.Hours += hours;
durationStruct.Minutes -= hours * Constants.MINUTES_PER_HOUR;
}
if (durationStruct.Hours >= Constants.HOURS_PER_DAY)
{
int days = durationStruct.Hours / Constants.HOURS_PER_DAY;
durationStruct.Days += days;
durationStruct.Hours -= days * Constants.HOURS_PER_DAY;
}
if (durationStruct.Days >= Constants.DAYS_PER_MONTH)
{
int years = durationStruct.Days / Constants.DAYS_PER_YEAR;
int days = durationStruct.Days - (years * Constants.DAYS_PER_YEAR);
int months = (days / Constants.DAYS_PER_MONTH);
durationStruct.Years += years;
durationStruct.Months += months;
durationStruct.Days -= (years * Constants.DAYS_PER_YEAR) + (months * Constants.DAYS_PER_MONTH);
}
if (durationStruct.Months >= Constants.MONTHS_PER_YEAR)
{
int years = durationStruct.Months / Constants.MONTHS_PER_YEAR;
int months = durationStruct.Months - (years * Constants.MONTHS_PER_YEAR);
durationStruct.Years += years;
durationStruct.Months = months;
}
pattern += (durationStruct.Years > 0 ? durationStruct.Years + Constants.TAG_YEARS : string.Empty);
pattern += (durationStruct.Months > 0 ? durationStruct.Months + Constants.TAG_MONTHS : string.Empty);
pattern += (durationStruct.Days > 0 ? durationStruct.Days + Constants.TAG_DAYS : string.Empty);
var patternTime = string.Empty;
patternTime += (durationStruct.Hours > 0 ? durationStruct.Hours + Constants.TAG_HOURS : string.Empty);
patternTime += (durationStruct.Minutes > 0 ? durationStruct.Minutes + Constants.TAG_MINUTES : string.Empty);
patternTime += (durationStruct.Seconds > 0 ? durationStruct.Seconds + Constants.TAG_SECONDS : string.Empty);
if (!string.IsNullOrEmpty(patternTime))
{
pattern += Constants.TAG_TIME + patternTime;
}
return(pattern);
}
public TimeSpan ToTimeSpan(DurationStruct durationStruct)
{
durationStruct.Days = CalculateDays(durationStruct.Years, durationStruct.Months, durationStruct.Days);
return(new TimeSpan(durationStruct.Days, durationStruct.Hours, durationStruct.Minutes, durationStruct.Seconds));
}
public DurationStruct ToDurationStruct(string pattern)
{
if (pattern.IsNullOrEmpty() ||
pattern == Constants.TAG_PERIOD || // ISO8601 doesn't allow "P" to indicate a TimeSpan of 0
pattern.EndsWith(Constants.TAG_TIME)) // Ensure time pattern contains any data
{
throw new Iso8601DurationException(EXCEPTION_PATTERN_NOT_VALID);
}
try
{
var regex = new Regex(DURATION_EXPRESSION_REGEX);
var match = regex.Match(pattern);
if (!match.Success)
{
throw new Iso8601DurationException(EXCEPTION_PATTERN_NOT_VALID);
}
var years = match.Groups["years"];
var months = match.Groups["months"];
var weeks = match.Groups["weeks"];
var days = match.Groups["days"];
var hours = match.Groups["hours"];
var minutes = match.Groups["minutes"];
var seconds = match.Groups["seconds"];
var durationStruct = new DurationStruct();
if (years.Length > 0)
{
durationStruct.Years = int.Parse(years.Value);
}
if (months.Length > 0)
{
durationStruct.Months = int.Parse(months.Value);
}
// Convert Weeks to Days to avoid precission loss when doing calculations with DateTimes
if (weeks.Length > 0)
{
durationStruct.Days += int.Parse(weeks.Value) * Constants.DAYS_PER_WEEK;
}
if (days.Length > 0)
{
durationStruct.Days += int.Parse(days.Value);
}
if (hours.Length > 0)
{
durationStruct.Hours = int.Parse(hours.Value);
}
if (minutes.Length > 0)
{
durationStruct.Minutes = int.Parse(minutes.Value);
}
if (seconds.Length > 0)
{
durationStruct.Seconds = int.Parse(seconds.Value);
}
return(durationStruct);
}
catch (Exception ex)
{
throw new Iso8601DurationException(EXCEPTION_GENERIC_ERROR, ex);
}
}
public string ToString(DurationStruct durationStruct)
{
return(GetPatternFromDurationStruct(durationStruct));
}