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refactor(date)!: birthdate improvements (#2756)
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@ST-DDT
ST-DDT committed Apr 1, 2024
1 parent 6191a5d commit b498d1f
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6 changes: 6 additions & 0 deletions docs/guide/upgrading_v9/2756.md
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### Changed default mode from birthdate

Previously, the method had defaults that were unclear in their specific impact.
Now, the method requires either none or all of the `min`, `max` and `mode` options.

We also improved the error messages in case of invalid min/max age/year ranges.
237 changes: 173 additions & 64 deletions src/modules/date/index.ts
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Expand Up @@ -357,90 +357,199 @@ export class SimpleDateModule extends SimpleModuleBase {
}

/**
* Returns a random birthdate.
* Returns a random birthdate. By default, the birthdate is generated for an adult between 18 and 80 years old.
* But you can customize the `'age'` range or the `'year'` range to generate a more specific birthdate.
*
* @param options The options to use to generate the birthdate. If no options are set, an age between 18 and 80 (inclusive) is generated.
* @param options.min The minimum age or year to generate a birthdate.
* @param options.max The maximum age or year to generate a birthdate.
* @param options.refDate The date to use as reference point for the newly generated date. Defaults to `now`.
* @param options.mode The mode to generate the birthdate. Supported modes are `'age'` and `'year'` .
* @param options The options to use to generate the birthdate.
* @param options.refDate The date to use as reference point for the newly generated date. Defaults to `faker.defaultRefDate()`.
*
* @example
* faker.date.birthdate() // 1977-07-10T01:37:30.719Z
*
* @since 7.0.0
*/
birthdate(options?: {
/**
* The date to use as reference point for the newly generated date.
*
* @default faker.defaultRefDate()
*/
refDate?: string | Date | number;
}): Date;
/**
* Returns a random birthdate for a given age range.
*
* @param options The options to use to generate the birthdate.
* @param options.mode `'age'` to generate a birthdate based on the age range. It is also possible to generate a birthdate based on a `'year'` range.
* @param options.min The minimum age to generate a birthdate for.
* @param options.max The maximum age to generate a birthdate for.
* @param options.refDate The date to use as reference point for the newly generated date. Defaults to `faker.defaultRefDate()`.
*
* @example
* faker.date.birthdate({ mode: 'age', min: 18, max: 65 }) // 2003-11-02T20:03:20.116Z
*
* There are two modes available `'age'` and `'year'`:
* - `'age'`: The min and max options define the age of the person (e.g. `18` - `42`).
* - `'year'`: The min and max options define the range the birthdate may be in (e.g. `1900` - `2000`).
* @since 7.0.0
*/
birthdate(options: {
/**
* `'age'` to generate a birthdate based on the age range.
* It is also possible to generate a birthdate based on a `'year'` range.
*/
mode: 'age';
/**
* The minimum age to generate a birthdate for.
*/
min: number;
/**
* The maximum age to generate a birthdate for.
*/
max: number;
/**
* The date to use as reference point for the newly generated date.
*
* @default faker.defaultRefDate()
*/
refDate?: string | Date | number;
}): Date;
/**
* Returns a random birthdate in the given range of years.
*
* @param options The options to use to generate the birthdate.
* @param options.mode `'year'` to generate a birthdate based on the year range. It is also possible to generate a birthdate based on a `'age'` range.
* @param options.min The minimum year to generate a birthdate in.
* @param options.max The maximum year to generate a birthdate in.
*
* @example
* faker.date.birthdate({ mode: 'year', min: 1900, max: 2000 }) // 1940-08-20T08:53:07.538Z
*
* @since 7.0.0
*/
birthdate(options: {
/**
* `'year'` to generate a birthdate based on the year range.
* It is also possible to generate a birthdate based on an `'age'` range.
*/
mode: 'year';
/**
* The minimum year to generate a birthdate in.
*/
min: number;
/**
* The maximum year to generate a birthdate in.
*/
max: number;
}): Date;
/**
* Returns a random birthdate. By default, the birthdate is generated for an adult between 18 and 80 years old.
* But you can customize the `'age'` range or the `'year'` range to generate a more specific birthdate.
*
* Defaults to `year`.
* @param options The options to use to generate the birthdate.
* @param options.mode Either `'age'` or `'year'` to generate a birthdate based on the age or year range.
* @param options.min The minimum age or year to generate a birthdate in.
* @param options.max The maximum age or year to generate a birthdate in.
* @param options.refDate The date to use as reference point for the newly generated date.
* Only used when `mode` is `'age'`.
* Defaults to `faker.defaultRefDate()`.
*
* @example
* faker.date.birthdate() // 1977-07-10T01:37:30.719Z
* faker.date.birthdate({ min: 18, max: 65, mode: 'age' }) // 2003-11-02T20:03:20.116Z
* faker.date.birthdate({ min: 1900, max: 2000, mode: 'year' }) // 1940-08-20T08:53:07.538Z
* faker.date.birthdate({ mode: 'age', min: 18, max: 65 }) // 2003-11-02T20:03:20.116Z
* faker.date.birthdate({ mode: 'year', min: 1900, max: 2000 }) // 1940-08-20T08:53:07.538Z
*
* @since 7.0.0
*/
birthdate(
options?:
| {
/**
* The date to use as reference point for the newly generated date.
*
* @default faker.defaultRefDate()
*/
refDate?: string | Date | number;
}
| {
/**
* Either `'age'` or `'year'` to generate a birthdate based on the age or year range.
*/
mode: 'age' | 'year';
/**
* The minimum age/year to generate a birthdate for/in.
*/
min: number;
/**
* The maximum age/year to generate a birthdate for/in.
*/
max: number;
/**
* The date to use as reference point for the newly generated date.
* Only used when `mode` is `'age'`.
*
* @default faker.defaultRefDate()
*/
refDate?: string | Date | number;
}
): Date;
birthdate(
options: {
/**
* The minimum age or year to generate a birthdate.
*
* @default 18
*/
mode?: 'age' | 'year';
min?: number;
/**
* The maximum age or year to generate a birthdate.
*
* @default 80
*/
max?: number;
/**
* The mode to generate the birthdate. Supported modes are `'age'` and `'year'` .
*
* There are two modes available `'age'` and `'year'`:
* - `'age'`: The min and max options define the age of the person (e.g. `18` - `42`).
* - `'year'`: The min and max options define the range the birthdate may be in (e.g. `1900` - `2000`).
*
* @default 'year'
*/
mode?: 'age' | 'year';
/**
* The date to use as reference point for the newly generated date.
*
* @default faker.defaultRefDate()
*/
refDate?: string | Date | number;
} = {}
): Date {
const { mode = 'year', refDate = this.faker.defaultRefDate() } = options;
const date = toDate(refDate);
const refYear = date.getUTCFullYear();

// If no min or max is specified, generate a random date between (now - 80) years and (now - 18) years respectively
// So that people can still be considered as adults in most cases

// Convert to epoch timestamps
let min: number;
let max: number;
if (mode === 'age') {
min = new Date(date).setUTCFullYear(refYear - (options.max ?? 80) - 1);
max = new Date(date).setUTCFullYear(refYear - (options.min ?? 18));
} else {
// Avoid generating dates the first and last date of the year
// to avoid running into other years depending on the timezone.
min = new Date(Date.UTC(0, 0, 2)).setUTCFullYear(
options.min ?? refYear - 80
);
max = new Date(Date.UTC(0, 11, 30)).setUTCFullYear(
options.max ?? refYear - 19
);
}

if (max < min) {
const {
mode = 'age',
min = 18,
max = 80,
refDate: rawRefDate = this.faker.defaultRefDate(),
mode: originalMode,
min: originalMin,
max: originalMax,
} = options;

// TODO @ST-DDT 2024-03-17: Remove check in v10
const optionsSet = [originalMin, originalMax, originalMode].filter(
(x) => x != null
).length;
if (optionsSet % 3 !== 0) {
throw new FakerError(
`Max ${options.max} should be larger than or equal to min ${options.min}.`
"The 'min', 'max', and 'mode' options must be set together."
);
}

return new Date(this.faker.number.int({ min, max }));
const refDate = toDate(rawRefDate);
const refYear = refDate.getUTCFullYear();

switch (mode) {
case 'age': {
const from = new Date(refDate).setUTCFullYear(refYear - max - 1);
const to = new Date(refDate).setUTCFullYear(refYear - min);

if (from > to) {
throw new FakerError(
`Max age ${max} should be greater than or equal to min age ${min}.`
);
}

return this.between({ from, to });
}

case 'year': {
// Avoid generating dates on the first and last date of the year
// to avoid running into other years depending on the timezone.
const from = new Date(Date.UTC(0, 0, 2)).setUTCFullYear(min);
const to = new Date(Date.UTC(0, 11, 30)).setUTCFullYear(max);

if (from > to) {
throw new FakerError(
`Max year ${max} should be greater than or equal to min year ${min}.`
);
}

return this.between({ from, to });
}
}
}
}

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30 changes: 9 additions & 21 deletions test/modules/__snapshots__/date.spec.ts.snap
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Expand Up @@ -67,17 +67,13 @@ exports[`date > 42 > betweens > with string dates and count 1`] = `

exports[`date > 42 > birthdate > with age and refDate 1`] = `1980-07-07T19:06:53.165Z`;

exports[`date > 42 > birthdate > with age mode and refDate 1`] = `1963-09-27T06:10:42.813Z`;

exports[`date > 42 > birthdate > with age range and refDate 1`] = `1962-12-27T20:14:08.437Z`;

exports[`date > 42 > birthdate > with only refDate 1`] = `1964-03-22T08:05:48.849Z`;

exports[`date > 42 > birthdate > with year and refDate 1`] = `0020-07-07T19:06:53.165Z`;
exports[`date > 42 > birthdate > with only refDate 1`] = `1963-09-27T06:10:42.813Z`;

exports[`date > 42 > birthdate > with year mode and refDate 1`] = `1964-03-22T08:05:48.849Z`;
exports[`date > 42 > birthdate > with year 1`] = `2000-05-16T22:59:36.655Z`;

exports[`date > 42 > birthdate > with year range and refDate 1`] = `0057-12-20T11:59:38.353Z`;
exports[`date > 42 > birthdate > with year range 1`] = `1937-10-30T15:52:21.843Z`;

exports[`date > 42 > future > with only Date refDate 1`] = `2021-07-08T10:07:33.524Z`;

Expand Down Expand Up @@ -195,17 +191,13 @@ exports[`date > 1211 > betweens > with string dates and count 1`] = `

exports[`date > 1211 > birthdate > with age and refDate 1`] = `1981-01-26T13:16:31.426Z`;

exports[`date > 1211 > birthdate > with age mode and refDate 1`] = `1998-08-21T21:24:31.101Z`;

exports[`date > 1211 > birthdate > with age range and refDate 1`] = `1996-10-13T01:44:07.954Z`;

exports[`date > 1211 > birthdate > with only refDate 1`] = `1998-07-25T13:16:47.251Z`;
exports[`date > 1211 > birthdate > with only refDate 1`] = `1998-08-21T21:24:31.101Z`;

exports[`date > 1211 > birthdate > with year and refDate 1`] = `0021-01-26T13:16:31.426Z`;
exports[`date > 1211 > birthdate > with year 1`] = `2000-12-04T01:16:03.291Z`;

exports[`date > 1211 > birthdate > with year mode and refDate 1`] = `1998-07-25T13:16:47.251Z`;

exports[`date > 1211 > birthdate > with year range and refDate 1`] = `0113-12-03T19:45:28.165Z`;
exports[`date > 1211 > birthdate > with year range 1`] = `1993-10-11T07:45:00.030Z`;

exports[`date > 1211 > future > with only Date refDate 1`] = `2022-01-26T14:59:27.356Z`;

Expand Down Expand Up @@ -321,17 +313,13 @@ exports[`date > 1337 > betweens > with string dates and count 1`] = `

exports[`date > 1337 > birthdate > with age and refDate 1`] = `1980-05-27T14:46:44.794Z`;

exports[`date > 1337 > birthdate > with age mode and refDate 1`] = `1956-08-25T03:56:58.153Z`;

exports[`date > 1337 > birthdate > with age range and refDate 1`] = `1956-02-15T21:16:37.850Z`;

exports[`date > 1337 > birthdate > with only refDate 1`] = `1957-03-31T18:18:16.563Z`;

exports[`date > 1337 > birthdate > with year and refDate 1`] = `0020-05-27T14:46:44.794Z`;
exports[`date > 1337 > birthdate > with only refDate 1`] = `1956-08-25T03:56:58.153Z`;

exports[`date > 1337 > birthdate > with year mode and refDate 1`] = `1957-03-31T18:18:16.563Z`;
exports[`date > 1337 > birthdate > with year 1`] = `2000-04-06T02:45:32.287Z`;

exports[`date > 1337 > birthdate > with year range and refDate 1`] = `0046-08-09T19:19:14.289Z`;
exports[`date > 1337 > birthdate > with year range 1`] = `1926-06-20T07:18:01.782Z`;

exports[`date > 1337 > future > with only Date refDate 1`] = `2021-05-28T08:29:26.600Z`;

Expand Down

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