C# DateTime print precision to microseconds

namespace ConsoleApp9
{
    internal class Program
    {
        static async Task Main(string[] args)
        {
            await PeriodicalTimerDemo();
        }

        static async Task PeriodicalTimerDemo()
        {
            long idx = 0;
            var periodic = new PeriodicTimer(TimeSpan.FromSeconds(1));
            while (await periodic.WaitForNextTickAsync())
            {                
                var dt = DateTime.Now;
#if NET7_0_OR_GREATER
                Console.WriteLine($"Idx:{Interlocked.Increment(ref idx)},{dt:yyyyMMddHHmmss},{dt.Millisecond:D3},{dt.Microsecond:D3}");
#else
                int microseconds=(int)(dt.Ticks%10000L)*100;
                Console.WriteLine($"Idx:{Interlocked.Increment(ref idx)},{dt:yyyyMMddHHmmss},{dt.Millisecond:D3},{microseconds:D3}");
#endif
            }
        }
    }
}

 

 

 

Idx:1,20260318225823,078,550
Idx:2,20260318225824,083,852
Idx:3,20260318225825,081,992
Idx:4,20260318225826,078,806
Idx:5,20260318225827,089,330
Idx:6,20260318225828,078,888
Idx:7,20260318225829,081,529
Idx:8,20260318225830,077,461
Idx:9,20260318225831,078,272
Idx:10,20260318225832,089,761
Idx:11,20260318225833,082,224
Idx:12,20260318225834,089,935
Idx:13,20260318225835,082,938
Idx:14,20260318225836,077,718
Idx:15,20260318225837,089,501
Idx:16,20260318225838,085,553
Idx:17,20260318225839,083,220
Idx:18,20260318225840,080,461
Idx:19,20260318225841,080,148
Idx:20,20260318225842,091,826
Idx:21,20260318225843,077,704
Idx:22,20260318225844,075,862
Idx:23,20260318225845,089,458
Idx:24,20260318225846,083,781
Idx:25,20260318225847,085,645
Idx:26,20260318225848,080,265
Idx:27,20260318225849,089,843
Idx:28,20260318225850,084,761
Idx:29,20260318225851,081,516
Idx:30,20260318225852,085,121
Idx:31,20260318225853,084,545
Idx:32,20260318225854,081,478
Idx:33,20260318225855,088,859
Idx:34,20260318225856,088,164
Idx:35,20260318225857,083,039
Idx:36,20260318225858,074,867
Idx:37,20260318225859,086,694
Idx:38,20260318225900,083,387
Idx:39,20260318225901,076,941
Idx:40,20260318225902,086,705
Idx:41,20260318225903,077,369
Idx:42,20260318225904,089,102
Idx:43,20260318225905,087,997
Idx:44,20260318225906,079,256
Idx:45,20260318225907,089,105
Idx:46,20260318225908,079,654
Idx:47,20260318225909,075,703
Idx:48,20260318225910,078,652
Idx:49,20260318225911,089,136
Idx:50,20260318225912,085,375
Idx:51,20260318225913,081,687
Idx:52,20260318225914,076,458
Idx:53,20260318225915,087,823
Idx:54,20260318225916,077,432
Idx:55,20260318225917,082,028
Idx:56,20260318225918,081,955
Idx:57,20260318225919,089,518
Idx:58,20260318225920,082,625
Idx:59,20260318225921,080,940
Idx:60,20260318225922,079,523
Idx:61,20260318225923,077,341
Idx:62,20260318225924,078,989
Idx:63,20260318225925,089,940
Idx:64,20260318225926,085,318
Idx:65,20260318225927,082,639
Idx:66,20260318225928,087,783
Idx:67,20260318225929,080,447
Idx:68,20260318225930,075,693
Idx:69,20260318225931,085,554
Idx:70,20260318225932,081,865
Idx:71,20260318225933,080,118
Idx:72,20260318225934,081,262
Idx:73,20260318225935,077,701
Idx:74,20260318225936,088,787
Idx:75,20260318225937,085,029
Idx:76,20260318225938,075,424
Idx:77,20260318225939,078,488
Idx:78,20260318225940,079,745
Idx:79,20260318225941,074,703
Idx:80,20260318225942,080,667
Idx:81,20260318225943,076,907
Idx:82,20260318225944,089,796
Idx:83,20260318225945,079,277
Idx:84,20260318225946,080,296
Idx:85,20260318225947,078,775
Idx:86,20260318225948,086,470
Idx:87,20260318225949,084,613
Idx:88,20260318225950,082,455
Idx:89,20260318225951,082,900
Idx:90,20260318225952,079,693
Idx:91,20260318225953,089,305
Idx:92,20260318225954,087,777
Idx:93,20260318225955,082,283
Idx:94,20260318225956,079,219
Idx:95,20260318225957,075,031
Idx:96,20260318225958,075,499
Idx:97,20260318225959,083,137
Idx:98,20260318230000,075,244
Idx:99,20260318230001,078,233
Idx:100,20260318230002,087,550
Idx:101,20260318230003,075,410
Idx:102,20260318230004,074,935
Idx:103,20260318230005,089,576
Idx:104,20260318230006,087,642
Idx:105,20260318230007,078,785
Idx:106,20260318230008,089,547
Idx:107,20260318230009,075,658
Idx:108,20260318230010,079,254
Idx:109,20260318230011,077,778
Idx:110,20260318230012,087,055
Idx:111,20260318230013,084,283
Idx:112,20260318230014,081,222
Idx:113,20260318230015,084,055
Idx:114,20260318230016,078,983
Idx:115,20260318230017,077,694