---
title: NullableDateRange
summary: API reference for NullableDateRange.
status: draft
owner: saif-docgen
last_reviewed: 2026-09-15
library: SAIF.Framework.Common
reference_type: package
---

# NullableDateRange

Date range whose end date may be open-ended (null), used to classify overlap relationships between two such ranges via `DateRangeOverlapResult`.

## Purpose
- Date range whose end date may be open-ended (null), used to classify overlap relationships between two such ranges via `DateRangeOverlapResult`.

## Context
- Namespace: `SAIF.Common`
- Assembly/package: `SAIF.Framework.Common`

## Public members
| Member | Signature | Purpose |
| --- | --- | --- |
| StartDate | `public DateTime StartDate { get; set; }` | The inclusive start of the range. |
| EndDate | `public DateTime? EndDate { get; set; }` | The inclusive end of the range, or null when the range is open-ended. |
| GetOverlapState(NullableDateRange, NullableDateRange) | `public static DateRangeOverlapResult GetOverlapState(NullableDateRange first, NullableDateRange second)` | Classifies how two (possibly open-ended) ranges relate to one another, returning one of the `DateRangeOverlapResult` directional states. ([BR-012](../../business-rules.md#br-012-the-overlap-of-two-nullable-end-ranges-is-classified-into-exactly-one-of-ten-enumerated-states)) |


## Sources
- `Common/SAIF.Common/Classes/NullableDateRange.cs`