timespan parser.cs

using System;
using System.Text.RegularExpressions;
					
public class Program
{
	public static Regex dateRegex = new Regex(@"(\d+)([smhd])",RegexOptions.Compiled | RegexOptions.IgnoreCase);
	public static void Main()
	{
		
		Console.WriteLine(DateTime.Now.Add(TS("1d")));
		Console.WriteLine(DateTime.Now.Add(TS("1h")));
		Console.WriteLine(DateTime.Now.Add(TS("24h")));
		Console.WriteLine(DateTime.Now.Add(TS("90m")));
	}
	public static TimeSpan TS(string _dateString)
	{
		var match = dateRegex.Match(_dateString);
		if(!match.Success)
			throw new ArgumentException("failed to parse");
		var part = match.Groups[2].Value.ToLower();
		var val = match.Groups[1];
		switch(part)
		{
			case "s":
			return TimeSpan.FromSeconds(int.Parse(val.Value));
			case "m":
			return TimeSpan.FromMinutes(int.Parse(val.Value));
			case "h":
			return TimeSpan.FromHours(int.Parse(val.Value));
			case "d":
			return TimeSpan.FromDays(int.Parse(val.Value));
			default:
			throw new ArgumentException("failed to parse");
		}
	}
}