Replacing all instances of UTC time in a string
I'm in the progress of upgrading a web application from .NET 1.1 to 2.0 and came across this function that I created which replaces all instances of date/time in a string. In the application users add notes and when it gets saved to the database it appends Added By [User] on [Date/Time] to the end of the notes. The date/time is added as UTC format, so I had to come up with a way to replace each instance of date/time to the users local time when the notes are viewed. Here's how I did it:
using System;
using System.Text.RegularExpressions;
public class TimeZoneConversionHelper
{
public static string RegexReplaceTime(string input, double timeZone)
{
string convertedText = String.Empty;
if ((input != String.Empty) && (input != null))
{
string pattern = @"\?*(((((0[13578])|([13578])|(1[02]))[\-\/\s]?\b((0[1-9])|([1-9])|([1-2][0-
9])|(3[01])))|((([469])|(11))[\-\/\s]?\b((0[1-9])|([1-9])|([1-2][0-9])|(30)))|((02|2)[\-\/\s]?\b((0[1-
9])|([1-9])|([1-2][0-9]))))[\-\/\s]?\b\d{4})(\s(((0[1-9])|([1-9])|(1[0-2]))\:([0-5][0-9])((\s)|(\:([0-5]
[0-9])\s))([AM|PM|am|pm]{2,2})))?";
MatchCollection matchCollection = Regex.Matches(input, pattern);
foreach (Match match in matchCollection)
{
DateTime conversionDateTime = TimeZoneConversion(Convert.ToDateTime(match.Value), timeZone);
convertedText = input.Replace(match.ToString(), conversionDateTime.ToString());
}
}
return convertedText;
}
public static DateTime TimeZoneConversion(DateTime utcTime, double timeZone)
{
return utcTime.AddHours(timeZone);
}
}
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