UG documentation 988674: FAQ for how to convert text‑formatted date values to DateTime in an Excel workbook

FAQ/DateTime/.NET/TextToDateTimeConverter/TextToDateTimeConverter.slnx

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+<Solution>
+  <Project Path="TextToDateTimeConverter/TextToDateTimeConverter.csproj" />
+</Solution>

FAQ/DateTime/.NET/TextToDateTimeConverter/TextToDateTimeConverter/Program.cs

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+using Syncfusion.XlsIO;
+using System.Globalization;
+
+namespace FirstUsedCellInUsedRange
+{
+    class Program
+    {
+        public static void Main(string[] args)
+        {
+
+            using (ExcelEngine excelEngine = new ExcelEngine())
+            {
+                IApplication application = excelEngine.Excel;
+                application.DefaultVersion = ExcelVersion.Xlsx;
+
+                //Open the input workbook
+                IWorkbook workbook = application.Workbooks.Open(Path.GetFullPath(@"Data/Input.xlsx"));
+
+                //Access the first worksheet
+                IWorksheet worksheet = workbook.Worksheets[0];
+
+                //Get the used range to iterate through populated cells
+                IRange used = worksheet.UsedRange;
+
+                //Set culture and parsing styles for interpreting text dates
+                CultureInfo culture = new CultureInfo("en-IN");
+                DateTimeStyles styles = DateTimeStyles.None;
+
+                //Iterate through the used range and convert text-formatted dates to DateTime
+                for (int row = used.Row; row <= used.LastRow; row++)
+                {
+                    for (int col = used.Column; col <= used.LastColumn; col++)
+                    {
+                        IRange cell = worksheet[row, col];
+                        DateTime date;
+
+                        //Log if the cell already contains a true DateTime
+                        if (cell.HasDateTime)
+                        {
+                            Console.WriteLine(cell.DateTime);
+                        }
+                        //Try parsing text using the specified culture and assign DateTime back to the cell
+                        else if (DateTime.TryParse(cell.Value, culture, styles, out date))
+                        {
+                            cell.DateTime = date;
+                        }
+                    }
+                }
+
+                //Saving the workbook
+                workbook.SaveAs(Path.GetFullPath(@"Output/Output.xlsx"));
+            }
+
+        }
+    }
+}

FAQ/DateTime/.NET/TextToDateTimeConverter/TextToDateTimeConverter/TextToDateTimeConverter.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.XlsIO.Net.Core" Version="*" />
+  </ItemGroup>
+
+  <ItemGroup>
+		<None Update="Data\*">
+			<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+		</None>
+		<None Update="Output\*">
+			<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+		</None>
+  </ItemGroup>
+
+</Project>