---
title: "SupplyDate – API-Referenz · Quittio"
description: "The date that decides the VAT rate of a line: the end of the line period (BT-135), its start (BT-134), the VAT point date (BT-7), the actual delivery date (BT-72), the end of the invoicing period (BT-74) and finally the issue date (BT-2), in this order."
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---

> Index of every page on this site: [llms.txt](https://quittio.dev/llms.txt)

[API reference](https://quittio.dev/docs/api) / [Quittio](https://quittio.dev/docs/api/Quittio) \\ [Core](https://quittio.dev/docs/api/Quittio/Core) \\ [Tax](https://quittio.dev/docs/api/Quittio/Core/Tax)

# SupplyDate

final class in quittio/core

`Quittio\Core\Tax\SupplyDate` · [Source](https://github.com/Quittio/quittio/blob/v0.7.1/packages/core/src/Tax/SupplyDate.php#L17)

The date that decides the VAT rate of a line: the end of the line period (BT-135), its start (BT-134), the VAT point date (BT-7), the actual delivery date (BT-72), the end of the invoicing period (BT-74) and finally the issue date (BT-2), in this order.

## Methods \#

| Method | Description |
| --- | --- |
| `::ofLine()` | The supply date of a line of the invoice. |
| `::resolve()` | The first date that is set, in the order above; null if none is. |

### `ofLine()`#

```
public static function ofLine(InvoiceData $invoice, InvoiceLine $line): Date
```

static

The supply date of a line of the invoice.

| Parameter | Type | Description |
| --- | --- | --- |
| `$invoice` | `[InvoiceData](https://quittio.dev/docs/api/Quittio/Core/Data/InvoiceData)` | |
| `$line` | `[InvoiceLine](https://quittio.dev/docs/api/Quittio/Core/Data/Lines/InvoiceLine)` | |

<dl><dt>Returns</dt>
<dd><code><a href="https://quittio.dev/docs/api/Quittio/Core/Support/Date">Date</a></code></dd>
</dl>

### `resolve()`#

```
public static function resolve(
    ?Period $linePeriod,
    ?Date $taxPointDate,
    ?Date $deliveryDate,
    ?Period $invoicingPeriod,
    ?Date $issueDate,
): ?Date
```

static

The first date that is set, in the order above; null if none is.

| Parameter | Type | Description |
| --- | --- | --- |
| `$linePeriod` | `? [Period](https://quittio.dev/docs/api/Quittio/Core/Data/Delivery/Period)` | |
| `$taxPointDate` | `? [Date](https://quittio.dev/docs/api/Quittio/Core/Support/Date)` | |
| `$deliveryDate` | `? [Date](https://quittio.dev/docs/api/Quittio/Core/Support/Date)` | |
| `$invoicingPeriod` | `? [Period](https://quittio.dev/docs/api/Quittio/Core/Data/Delivery/Period)` | |
| `$issueDate` | `? [Date](https://quittio.dev/docs/api/Quittio/Core/Support/Date)` | |

<dl><dt>Returns</dt>
<dd><code>?<a href="https://quittio.dev/docs/api/Quittio/Core/Support/Date">Date</a></code></dd>
</dl>

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