# Design Document: `Order.dateTime`

## 1. Overview

`Order.dateTime` is a string property defined in `typings.d.ts` for the `Order` data model. It represents the date and time associated with an order.

This field is part of the order type contract and is used to carry a timestamp-like value as text.

---

## 2. Node Information

- **Node ID:** `/data/ElecCom/typings.d.ts.Order.dateTime`
- **Name:** `dateTime`
- **Type:** property
- **File:** `/data/ElecCom/typings.d.ts`
- **Declared Type:** `string`
- **Definition:** `dateTime: string;`

---

## 3. Purpose

The `dateTime` field provides a textual representation of the order's date/time information. It is intended to support:

- displaying order creation or scheduling time
- transmitting order timestamps through APIs or typed data structures
- serializing date/time values without enforcing a specific runtime date object type

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## 4. Data Contract

### Type
```ts
dateTime: string;
```

### Expected Format
The source definition does not enforce a specific format. In practice, the value should be a stable, machine-readable date/time string, such as:

- ISO 8601: `2026-05-18T10:30:00Z`
- Localized display string, if agreed by the application contract

### Constraints
- Must be a string
- Should be non-empty when the order requires a timestamp
- Formatting and timezone handling are the responsibility of the producer and consumer of this field

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## 5. Behavioral Notes

- This property does **not** provide validation logic by itself.
- It does **not** encode date/time semantics beyond storing a string value.
- It is suitable for typed data exchange, especially where date/time objects are not desired in the interface layer.

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## 6. Integration Considerations

### Producer Responsibilities
Any code assigning `Order.dateTime` should ensure:
- the value matches the agreed application format
- timezone expectations are explicit
- the string can be parsed by downstream consumers if needed

### Consumer Responsibilities
Any code reading `Order.dateTime` should:
- treat it as an opaque string unless the format is formally specified
- parse it safely before performing date-based calculations
- handle missing or malformed values if upstream validation is not guaranteed

---

## 7. Example

```ts
interface Order {
  dateTime: string;
}
```

### Sample Value
```ts
const order: Order = {
  dateTime: "2026-05-18T10:30:00Z"
};
```

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## 8. Risks and Caveats

- Ambiguous date formatting may lead to parsing issues across locales
- Lack of timezone standardization may cause inconsistent interpretation
- Since the field is only typed as `string`, invalid date values are possible unless validated elsewhere

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## 9. Recommended Usage

Use `dateTime` for:
- order timestamps
- API payloads
- serialized order records

Prefer a standardized format such as ISO 8601 for interoperability.

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## 10. Summary

`Order.dateTime` is a simple string-based timestamp field used to store date/time information for an order. It is intentionally lightweight, leaving format validation and parsing rules to surrounding application logic.