using System;
using System.Globalization;
using System.Linq;
using System.Collections.Generic;
using System.Threading;
public class Test
{
public static void Main()
{
int day = 1;
string dayStr = day.ToString("D2");
Console.WriteLine("ToString:" + dayStr);
dayStr = "1";
dayStr = dayStr.PadLeft(2, '0');
Console.WriteLine("PadLeft:" + dayStr);
}
}
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