> ## Documentation Index
> Fetch the complete documentation index at: https://easyaf.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# DateTime

> Extension methods for DateTime from System.Runtime

## Definition

**Assembly:** System.Runtime.dll

**Namespace:** System

## Syntax

```csharp theme={"dark"}
System.DateTime
```

## Summary

This type is defined in System.Runtime.

## Remarks

See [Microsoft documentation](https://learn.microsoft.com/dotnet/api/system.datetime) for more information about the rest of the API.

## Methods

### <Icon icon="puzzle-piece" iconType="duotone" color="#E0EC32" size={24} className="mr-2" /> DaysInMonth <Badge color="green">Extension</Badge>

<Note>Extension method from `System.EasyAF_DateTimeExtensions`</Note>

#### Syntax

```csharp theme={"dark"}
public static int DaysInMonth(System.DateTime value)
```

#### Parameters

| Name    | Type              | Description |
| ------- | ----------------- | ----------- |
| `value` | `System.DateTime` | -           |

#### Returns

Type: `int`

#### Remarks

[https://stackoverflow.com/questions/24245523/getting-the-first-and-last-day-of-a-month-using-a-given-datetime-object](https://stackoverflow.com/questions/24245523/getting-the-first-and-last-day-of-a-month-using-a-given-datetime-object)

### <Icon icon="puzzle-piece" iconType="duotone" color="#E0EC32" size={24} className="mr-2" /> FirstDayOfMonth <Badge color="green">Extension</Badge>

<Note>Extension method from `System.EasyAF_DateTimeExtensions`</Note>

#### Syntax

```csharp theme={"dark"}
public static System.DateTime FirstDayOfMonth(System.DateTime value)
```

#### Parameters

| Name    | Type              | Description |
| ------- | ----------------- | ----------- |
| `value` | `System.DateTime` | -           |

#### Returns

Type: `System.DateTime`

#### Remarks

[https://stackoverflow.com/questions/24245523/getting-the-first-and-last-day-of-a-month-using-a-given-datetime-object](https://stackoverflow.com/questions/24245523/getting-the-first-and-last-day-of-a-month-using-a-given-datetime-object)

### <Icon icon="puzzle-piece" iconType="duotone" color="#E0EC32" size={24} className="mr-2" /> GetQuarter <Badge color="green">Extension</Badge>

<Note>Extension method from `System.EasyAF_DateTimeExtensions`</Note>

Calculates the quarter for the given [DateTime](/api-reference/System/DateTime), assuming a calendar-based fiscal year.

#### Syntax

```csharp theme={"dark"}
public static int GetQuarter(System.DateTime date)
```

#### Parameters

| Name   | Type              | Description                                                               |
| ------ | ----------------- | ------------------------------------------------------------------------- |
| `date` | `System.DateTime` | The [DateTime](/api-reference/System/DateTime) to use in the calculation. |

#### Returns

Type: `int`

#### Remarks

From [https://stackoverflow.com/questions/8698303/how-do-i-discover-the-quarter-of-a-given-date](https://stackoverflow.com/questions/8698303/how-do-i-discover-the-quarter-of-a-given-date)

### <Icon icon="puzzle-piece" iconType="duotone" color="#E0EC32" size={24} className="mr-2" /> GetQuarter <Badge color="green">Extension</Badge>

<Note>Extension method from `System.EasyAF_DateTimeExtensions`</Note>

Calculates the quarter for the given [DateTime](/api-reference/System/DateTime), assuming a the provided fiscal year begin date.

#### Syntax

```csharp theme={"dark"}
public static int GetQuarter(System.DateTime date, System.DateTime fiscalYearStart)
```

#### Parameters

| Name              | Type              | Description                                                                                                         |
| ----------------- | ----------------- | ------------------------------------------------------------------------------------------------------------------- |
| `date`            | `System.DateTime` | The [DateTime](/api-reference/System/DateTime) to use in the calculation.                                           |
| `fiscalYearStart` | `System.DateTime` | The [DateTime](/api-reference/System/DateTime) representing the start day of the fiscal year to use in calculation. |

#### Returns

Type: `int`

#### Remarks

From [https://stackoverflow.com/questions/8698303/how-do-i-discover-the-quarter-of-a-given-date](https://stackoverflow.com/questions/8698303/how-do-i-discover-the-quarter-of-a-given-date)

### <Icon icon="puzzle-piece" iconType="duotone" color="#E0EC32" size={24} className="mr-2" /> LastDayOfMonth <Badge color="green">Extension</Badge>

<Note>Extension method from `System.EasyAF_DateTimeExtensions`</Note>

#### Syntax

```csharp theme={"dark"}
public static System.DateTime LastDayOfMonth(System.DateTime value)
```

#### Parameters

| Name    | Type              | Description |
| ------- | ----------------- | ----------- |
| `value` | `System.DateTime` | -           |

#### Returns

Type: `System.DateTime`

#### Remarks

[https://stackoverflow.com/questions/24245523/getting-the-first-and-last-day-of-a-month-using-a-given-datetime-object](https://stackoverflow.com/questions/24245523/getting-the-first-and-last-day-of-a-month-using-a-given-datetime-object)