Function formatLocalDateTime

formatLocalDateTime(
date: Date,
options?: { precision?: LocalDateTimePrecision },
): string
Format a Date as an HTML datetime-local value using local fields.

Precision Output shape

minute YYYY-MM-DDTHH:mm

second YYYY-MM-DDTHH:mm:ss

millisecond YYYY-MM-DDTHH:mm:ss.SSS

Usage:
```
import { formatLocalDateTime } from "mazey";

const date = new Date(2026, 6, 21, 14, 30, 45, 123);
const minutes = formatLocalDateTime(date);
const seconds = formatLocalDateTime(date, { precision: "second" });
const milliseconds = formatLocalDateTime(date, {
  precision: "millisecond",
});
console.log(minutes);
console.log(seconds);
console.log(milliseconds);
```
Output:
```
2026-07-21T14:30
2026-07-21T14:30:45
2026-07-21T14:30:45.123
```
Parameters
- date: Date
  A valid Date to format.
- options: { precision?: LocalDateTimePrecision } = {}
  Formatting options. Precision defaults to minute.
Returns string
A normalized HTML datetime-local value containing local calendar fields. The year is padded to at least four digits.

Throws
If date is not a Date or precision is unsupported.

Throws
If date is invalid or its local year is earlier than 1.

Remarks
This function does not call toISOString() and does not convert the value to UTC. It does not mutate the supplied Date.
- Defined in date.ts:307