ChronoBox

ChronoBox is a lightweight, versatile, and easy-to-use TypeScript library for handling date manipulation and formatting. It provides a powerful API for adding, subtracting, comparing, and formatting dates.

🚀 Features

• Add and subtract time units (e.g., days, weeks, months, years) with ease
• Calculate differences between dates in various time units
• Retrieve individual components of a date
• Format dates using custom formats
• Built-in validation for date inputs
• Fully written in TypeScript with strong type safety

📦 Installation

npm install chronobox

📖 API Reference

ChronoBox

The ChronoBox class provides a convenient and powerful API for date manipulation, formatting, and validation.

Constructor

new ChronoBox<TFormat extends DateFormat | CustomFormat = DateFormat>(date?: DateInput, format?: TFormat)

• date (optional): The date to initialize the ChronoBox instance. If not provided, the current date and time will be used.
• format (optional): The format for the date output. Defaults to DateFormat.ISO.

Methods

add<T extends TimeUnit>(amount: number, unit: T): ChronoBox<TFormat>

Adds a specified amount of time to the current date.

• amount: The amount of time to add.
• unit: The unit of time to add (e.g., TimeUnit.DAYS, TimeUnit.MONTHS, etc.).
• returns: A new ChronoBox instance with the updated date.

subtract<T extends TimeUnit>(amount: number, unit: T): ChronoBox<TFormat>

Subtracts a specified amount of time from the current date.

• amount: The amount of time to subtract.
• unit: The unit of time to subtract.
• returns: A new ChronoBox instance with the updated date.

diff(other: DateInput, unit: TimeUnit = TimeUnit.DAYS): number

Calculates the difference between the current date and another date in the specified time unit.

• other: The other date to compare with.
• unit: The unit of time for the difference (e.g., TimeUnit.DAYS, TimeUnit.MONTHS, etc.).
• returns: The difference in the specified time unit.

getComponents(): DateComponents

Returns the individual components (year, month, day, hours, minutes, seconds, milliseconds) of the date.

• returns: An object with the above structure.

formatDate(): string

Formats the current date according to the specified format.

• returns: A string representation of the date based on the format.

isValid(): boolean

Checks whether the current date is valid.

• returns: true if the date is valid, otherwise false.

toDate(): Date

Returns the underlying Date object from the ChronoBox instance.

• returns: A Date object representing the current date.

withFormat<NewFormat extends DateFormat | CustomFormat>(newFormat: NewFormat): ChronoBox<NewFormat>

Creates a new ChronoBox instance with a different format.

• newFormat: The new format for the date.
• returns: A new ChronoBox instance with the updated format.

isAfter(other: DateInput, granularity: TimeUnit = TimeUnit.MILLISECONDS): boolean

Checks if this date is after the specified date.

• other: The date to compare against.
• granularity: The time unit granularity for comparison (defaults to milliseconds for exact comparison).
• returns: true if this date is after the specified date.

isBefore(other: DateInput, granularity: TimeUnit = TimeUnit.MILLISECONDS): boolean

Checks if this date is before the specified date.

• other: The date to compare against.
• granularity: The time unit granularity for comparison (defaults to milliseconds for exact comparison).
• returns: true if this date is before the specified date.

convertTimezone(date: Date | ChronoBox, fromTimezone: string, toTimezone: string): Date

Converts a date from one timezone to another

• date: The date to convert.
• fromTimezone: The source timezone (e.g., 'America/New_York').
• toTimezone: The target timezone (e.g., 'Europe/London').
• returns: A new Date object representing the same moment in the target timezone.

getTimezoneOffsetMinutes(date: Date | ChronoBox, timezone: string): number

Gets the timezone offset in minutes for a date in a specific timezone.

• date: The date to get the offset for.
• timezone: The timezone to get the offset for (e.g., 'America/New_York').
• returns: The timezone offset in minutes (positive for timezones behind UTC, negative for timezones ahead of UTC).

isInDST(date: Date | ChronoBox, timezone: string): boolean

Checks if a date is in Daylight Saving Time (DST) for a specific timezone.

• date: The date to check.
• timezone: The timezone to check for DST (e.g., 'America/New_York').
• returns: true if the date is in DST for the specified timezone, false otherwise.

findDSTTransitions(year: number, timezone: string): { start: Date | null; end: Date | null }

Finds the exact DST transition times for a given year in a specific timezone.

• year: The year to find DST transitions for.
• timezone: The timezone to check (e.g., 'America/New_York').
• returns: An object with start and end properties containing the DST transition dates, or null if no DST.

startOf<T extends TimeUnit>(unit: T): ChronoBox<TFormat>

Gets the start of a specified time unit for the current date.

• unit: The time unit to get the start of (e.g., day, hour, minute).
• Returns: A new ChronoBox instance set to the start of the specified unit.

endOf<T extends TimeUnit>(unit: T): ChronoBox<TFormat>

Gets the end of a specified time unit for the current date.

• unit: The time unit to get the end of (e.g., day, hour, minute).
• Returns: A new ChronoBox instance set to the end of the specified unit.

fromNow(referenceDate?: DateInput): string

Gets a human-readable string representing the time difference between the current date and now.

• referenceDate?: An optional date to compare against. Defaults to the current time.
• Returns: A string representing the relative time difference, e.g., "5 minutes ago", "in 2 days".

📄 License

ChronoBox is open-source software, licensed under the MIT License.

❤️ Support

If you find ChronoBox helpful, please give it a ⭐️ on GitHub and share it with your fellow developers!