FastDate 1.2.0-beta.1

.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher.
This is a prerelease version of FastDate.
There is a newer version of this package available.
See the version list below for details. 
dotnet add package FastDate --version 1.2.0-beta.1
                    


                    

                
NuGet\Install-Package FastDate -Version 1.2.0-beta.1
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="FastDate" Version="1.2.0-beta.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="FastDate" Version="1.2.0-beta.1" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="FastDate" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add FastDate --version 1.2.0-beta.1
                    


                    

                
#r "nuget: FastDate, 1.2.0-beta.1"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package FastDate@1.2.0-beta.1
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=FastDate&version=1.2.0-beta.1&prerelease
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=FastDate&version=1.2.0-beta.1&prerelease
                    


                            Install as a Cake Tool

CI NuGet Downloads NuGet Version codecov Rust C#

FastDate

FastDate is a SIMD vectorized datetime (ISO 8601) parser that is ~7x faster (86% less time) than DateTime.Parse()/ParseExact().

Usage

FastDate.FromISO8601("2026-04-12T15:04:05")

Benchmark


BenchmarkDotNet v0.15.8, macOS Tahoe 26.1 (25B78) [Darwin 25.1.0]
Apple M1, 1 CPU, 8 logical and 8 physical cores
.NET SDK 10.0.201
  [Host]     : .NET 10.0.5 (10.0.5, 10.0.526.15411), Arm64 RyuJIT armv8.0-a
  Job-CNUJVU : .NET 10.0.5 (10.0.5, 10.0.526.15411), Arm64 RyuJIT armv8.0-a

InvocationCount=1  UnrollFactor=1
Method Mean Error StdDev Median Ratio RatioSD Rank Allocated Alloc Ratio
Rust_FastDate_Utf8 1.235 μs 0.2020 μs 0.5796 μs 1.083 μs 0.12 0.08 1 - NA
Rust_FastDate_String 1.358 μs 0.2099 μs 0.5885 μs 1.292 μs 0.13 0.08 1 - NA
System_Utf8Parser 2.089 μs 0.3471 μs 0.9903 μs 1.812 μs 0.20 0.13 2 - NA
System_ParseExact 12.143 μs 1.5306 μs 4.4650 μs 11.126 μs 1.15 0.64 3 - NA
System_Parse 12.552 μs 1.5853 μs 4.3663 μs 11.729 μs 1.19 0.65 3 - NA

Supported Platforms

  • Apple ARM64 (NEON)
  • Windows x64 (SSE3)
  • Linux x64 (SSE3)

License

MIT License

Copyright (c) 2026 Greg James

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Product Compatible and additional computed target framework versions.
.NET net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

  • net10.0

    • No dependencies.

  • net8.0

    • No dependencies.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
1.2.0 78 4/18/2026
1.2.0-beta.2 45 4/18/2026
1.2.0-beta.1 38 4/18/2026
1.1.0 83 4/16/2026
1.1.0-beta.3 43 4/16/2026
1.1.0-beta.2 42 4/16/2026
1.1.0-beta.1 39 4/16/2026
1.0.2 86 4/13/2026
1.0.1 82 4/13/2026
1.0.1-beta.12 42 4/13/2026
1.0.1-beta.11 35 4/13/2026
1.0.1-beta.10 38 4/13/2026
1.0.1-beta.9 43 4/13/2026
1.0.1-beta.8 45 4/13/2026
1.0.1-beta.7 40 4/13/2026
1.0.1-beta.6 36 4/13/2026
1.0.1-beta.5 40 4/13/2026
1.0.1-beta.4 44 4/13/2026
1.0.1-beta.3 37 4/13/2026
1.0.1-beta.2 35 4/13/2026
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