DateMath 1.3.1

.NET Standard 2.0

dotnet add package DateMath --version 1.3.1

NuGet\Install-Package DateMath -Version 1.3.1

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="DateMath" Version="1.3.1" />

For projects that support PackageReference, copy this XML node into the project file to reference the package.

<PackageVersion Include="DateMath" Version="1.3.1" />
                    

                            Directory.Packages.props

<PackageReference Include="DateMath" />
                    

                            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 DateMath --version 1.3.1

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

#r "nuget: DateMath, 1.3.1"

#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 DateMath@1.3.1

#: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=DateMath&version=1.3.1
                    

                            Install as a Cake Addin

#tool nuget:?package=DateMath&version=1.3.1
                    

                            Install as a Cake Tool

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Date Math

DateMath parses and applies Elasticsearch-style date math expressions in .NET. It supports expressions anchored to the current UTC time or a specific date, arithmetic with common date units, and rounding.

The package targets .NET Standard 2.0, making it compatible with modern .NET and .NET Framework 4.6.1 or later. Microsoft recommends .NET Framework 4.7.2 or later when consuming .NET Standard 2.0 libraries.

Installation

Install the package with the .NET CLI:

dotnet add package DateMath

Or with the NuGet Package Manager Console:

Install-Package DateMath

Usage

Expressions can use now as their anchor:

using DaleNewman;

DateMath.Parse("now", "yyyy-MM-dd h tt");
DateMath.Parse("now+11h", "yyyy-MM-dd h tt");
DateMath.Parse("now-13h+1y+1d-1s", "yyyy-MM-dd HH:mm:ss");
DateMath.Parse("now/d", "yyyy-MM-dd HH:mm:ss.fff");

A fixed anchor date is separated from its math expression by ||:

var result = DateMath.Parse("2016-12-31 1 PM||+11h", "yyyy-MM-dd h tt");
// 2017-01-01 12 AM

Use TryParse when you need to check whether parsing succeeded:

if (DateMath.TryParse("now+11h", out DateTime date))
{
    // Use date.
}

Use Apply when you already have a date:

var date = new DateTime(2016, 12, 31, 9, 30, 2);
var newYears = DateMath.Apply(date, "+1d/y");
// 2017-01-01 00:00:00

Operators

Unit	Meaning
`y`	Year
`M`	Month
`w`	Week
`d`	Day
`h`	Hour
`m`	Minute
`s`	Second

Prefix a unit with + or - to add or subtract it, such as now-10d. Prefix it with / to round down, such as now/M for the start of the current month.

Common reporting ranges include:

Range	Start	End
Last 10 days	`now-10d`	`now`
Month to date	`now/M`	`now`
Year to date	`now/y`	`now`
Sliding 60-day window	`now-30d`	`now+30d`

See the tests for more examples, the changelog for release history, and the NuGet packaging guide for local release instructions.

Contributing

Issues and pull requests are welcome in the GitHub repository. Build and test locally with:

dotnet test --configuration Release

DateMath is licensed under the Apache License 2.0.

Product	Compatible and additional computed target framework versions.
.NET	net5.0 was computed. net5.0-windows was computed. net6.0 was computed. net6.0-android was computed. net6.0-ios was computed. net6.0-maccatalyst was computed. net6.0-macos was computed. net6.0-tvos was computed. net6.0-windows was computed. net7.0 was computed. net7.0-android was computed. net7.0-ios was computed. net7.0-maccatalyst was computed. net7.0-macos was computed. net7.0-tvos was computed. net7.0-windows was computed. net8.0 was computed. 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 was computed. 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.
.NET Core	netcoreapp2.0 was computed. netcoreapp2.1 was computed. netcoreapp2.2 was computed. netcoreapp3.0 was computed. netcoreapp3.1 was computed.
.NET Standard	netstandard2.0 is compatible. netstandard2.1 was computed.
.NET Framework	net461 was computed. net462 was computed. net463 was computed. net47 was computed. net471 was computed. net472 was computed. net48 was computed. net481 was computed.
MonoAndroid	monoandroid was computed.
MonoMac	monomac was computed.
MonoTouch	monotouch was computed.
Tizen	tizen40 was computed. tizen60 was computed.
Xamarin.iOS	xamarinios was computed.
Xamarin.Mac	xamarinmac was computed.
Xamarin.TVOS	xamarintvos was computed.
Xamarin.WatchOS	xamarinwatchos was computed.

Compatible target framework(s)

Included target framework(s) (in package)

Learn more about Target Frameworks and .NET Standard.

.NETStandard 2.0
- No dependencies.

NuGet packages (3)

Showing the top 3 NuGet packages that depend on DateMath:

Package	Downloads
Transformalize Package Description	64.8K
Transformalize.Container.Autofac Package Description	19.5K
Transformalize.Transform.DateMath DateMath Transform for Transformalize	2.1K

GitHub repositories (1)

Showing the top 1 popular GitHub repositories that depend on DateMath:

Repository	Stars
dalenewman/Transformalize Configurable Extract, Transform, and Load	162

Version	Downloads	Last Updated
1.3.1	48	8/29/2026
1.3.0	43,898	8/30/2022
1.2.0	4,805	10/14/2020
1.1.0	8,400	12/23/2019
1.0.0	3,868	12/28/2016
0.2.0-beta	1,309	12/12/2016
0.1.0-beta	1,225	12/2/2016
0.0.5-beta	1,253	12/2/2016
0.0.4-beta	1,234	12/1/2016
0.0.3-beta	1,265	12/1/2016
0.0.2-beta	1,221	12/1/2016
0.0.1-beta	1,243	11/30/2016

https://github.com/dalenewman/DateMath/blob/main/CHANGELOG.md