public static DateTime Subtract(DateTime dateTime, DateTimeSpan dateTimeSpan)
{
dateTime = dateTime.AddSeconds(dateTimeSpan.Seconds * -1);
dateTime = dateTime.AddMinutes(dateTimeSpan.Minutes * -1);
dateTime = dateTime.AddHours(dateTimeSpan.Hours * -1);
dateTime = dateTime.AddDays(dateTimeSpan.Days * -1);
dateTime = dateTime.AddDays(dateTimeSpan.Weeks * 7 * -1);
dateTime = dateTime.AddMonths(dateTimeSpan.Months * -1);
dateTime = dateTime.AddYears(dateTimeSpan.Years * -1);
return(dateTime);
}
public static DateTime Add(DateTime dateTime, DateTimeSpan dateTimeSpan)
{
dateTime = dateTime.AddSeconds(dateTimeSpan.Seconds);
dateTime = dateTime.AddMinutes(dateTimeSpan.Minutes);
dateTime = dateTime.AddHours(dateTimeSpan.Hours);
dateTime = dateTime.AddDays(dateTimeSpan.Days);
dateTime = dateTime.AddDays(dateTimeSpan.Weeks * 7);
dateTime = dateTime.AddMonths(dateTimeSpan.Months);
dateTime = dateTime.AddYears(dateTimeSpan.Years);
return(dateTime);
}
// Parsing
public static DateTimeSpan Parse(string s)
{
s = s.Trim().ToLower();
DateTimeSpan dateTimeSpan = new DateTimeSpan();
Regex tokenRegex = new Regex(@"\d+\s{0,1}\w+");
Regex numberRegex = new Regex(@"\d{1,}");
Regex wordRegex = new Regex(@"[a-z]+");
var matches = tokenRegex.Matches(s);
List <Token> tokens = new List <Token>();
for (int i = 0; i < matches.Count; i++)
{
tokens.Add(new Token(int.Parse(numberRegex.Match(matches[i].Value).Value), wordRegex.Match(matches[i].Value).Value));
}
for (int i = 0; i < tokens.Count; i++)
{
if (second.Contains(tokens[i].Word))
{
dateTimeSpan.Seconds = tokens[i].Number;
}
else if (minute.Contains(tokens[i].Word))
{
dateTimeSpan.Minutes = tokens[i].Number;
}
else if (hour.Contains(tokens[i].Word))
{
dateTimeSpan.Hours = tokens[i].Number;
}
else if (day.Contains(tokens[i].Word))
{
dateTimeSpan.Days = tokens[i].Number;
}
else if (week.Contains(tokens[i].Word))
{
dateTimeSpan.Weeks = tokens[i].Number;
}
else if (month.Contains(tokens[i].Word))
{
dateTimeSpan.Months = tokens[i].Number;
}
else if (year.Contains(tokens[i].Word))
{
dateTimeSpan.Years = tokens[i].Number;
}
}
return(dateTimeSpan);
}
public override bool Equals(object obj)
{
if ((obj == null) || !this.GetType().Equals(obj.GetType()))
{
return(false);
}
DateTimeSpan dateTimeSpan = (DateTimeSpan)obj;
return(this.Days == dateTimeSpan.Days &&
this.Hours == dateTimeSpan.Hours &&
this.Minutes == dateTimeSpan.Minutes &&
this.Months == dateTimeSpan.Months &&
this.Seconds == dateTimeSpan.Seconds &&
this.Weeks == dateTimeSpan.Weeks &&
this.Years == dateTimeSpan.Years);
}
public static bool TryParse(string s, out DateTimeSpan dateTimeSpan)
{
dateTimeSpan = Parse(s);
return(!dateTimeSpan.IsEmpty);
}
