date-manip

---

date-manip / isBefore

isBefore

函数

default()

default(date, input, unit?): boolean

定义于: src/isBefore.ts:60

Checks if a date is before another date or a specified time unit. 检查一个日期是否在另一个日期或指定的时间单位之前。

参数

date

Date

The date to compare. (要比较的日期。)

input

DateInput

The date or time unit to compare against. (要比较的日期或时间单位。)

unit?

Unit

The unit of time to compare (e.g., 'year', 'month', 'day', 'hour', 'minute', 'second', 'millisecond'). (要比较的时间单位，例如 'year'、'month'、'day'、'hour'、'minute'、'second'、'millisecond'。)

返回

boolean

A boolean indicating whether the first date is before the second date or time unit. (布尔值，表示第一个日期是否在第二个日期或时间单位之前。)

示例

// Checking if a date is before another date (检查一个日期是否在另一个日期之前)
const date1 = new Date('2023-09-01');
const date2 = new Date('2023-10-01');
const isBeforeDate = isBefore(date1, date2, 'day');
console.log(isBeforeDate); // Outputs: true (输出: true)

// Checking if a date is before a specific year (检查一个日期是否在特定年份之前)
const date3 = new Date('2022-12-31');
const isBeforeYear = isBefore(date3, 2023, 'year');
console.log(isBeforeYear); // Outputs: true (输出: true)

// Checking if a date is before a specific month (检查一个日期是否在特定月份之前)
const date4 = new Date('2023-09-01');
const isBeforeMonth = isBefore(date4, '2023-10', 'month');
console.log(isBeforeMonth); // Outputs: true (输出: true)

// Checking if a date is before a specific day (检查一个日期是否在特定天数之前)
const date5 = new Date('2023-10-01');
const isBeforeDay = isBefore(date5, '2023-10-02', 'day');
console.log(isBeforeDay); // Outputs: true (输出: true)

// Checking if a date is before a specific hour (检查一个日期是否在特定小时之前)
const date6 = new Date('2023-10-01T12:00:00');
const isBeforeHour = isBefore(date6, '2023-10-01T13:00:00', 'hour');
console.log(isBeforeHour); // Outputs: true (输出: true)

// Checking if a date is before a specific minute (检查一个日期是否在特定分钟之前)
const date7 = new Date('2023-10-01T12:00:00');
const isBeforeMinute = isBefore(date7, '2023-10-01T12:01:00', 'minute');
console.log(isBeforeMinute); // Outputs: true (输出: true)

// Checking if a date is before a specific second (检查一个日期是否在特定秒数之前)
const date8 = new Date('2023-10-01T12:00:00');
const isBeforeSecond = isBefore(date8, '2023-10-01T12:00:01', 'second');
console.log(isBeforeSecond); // Outputs: true (输出: true)

// Checking if a date is before a specific millisecond (检查一个日期是否在特定毫秒数之前)
const date9 = new Date('2023-10-01T12:00:00.000');
const isBeforeMillisecond = isBefore(date9, '2023-10-01T12:00:00.500', 'millisecond');
console.log(isBeforeMillisecond); // Outputs: true (输出: true)