Fumanchu

Helpers

Migration

Project Guidelines

Date Helpers

Handlebars provides a comprehensive set of built-in helpers for working with dates. These helpers are used to format, manipulate, and compare dates, making it easier to display and work with date information.

Availability: Registered in both the Node and browser builds.

Table of Contents

Date Helpers

Fumanchu provides powerful date manipulation capabilities using dayjs and chrono-node for natural language date parsing.

{{year}}

Get the current year as a string.

Example

{{year}}

{{date}}

Format a date with support for human-readable date strings, Date objects, timestamps, or defaults to current date.

Parameters:

  • dateInput (optional): Date string, Date object, timestamp, or undefined (defaults to now)
  • format (optional): Format string (defaults to "YYYY-MM-DD")

Supported format tokens:

  • YYYY or yyyy: 4-digit year
  • YY or yy: 2-digit year
  • MM or mm: Month (01-12)
  • DD or dd: Day of month (01-31)
  • HH or hh: Hour (00-23)
  • mm: Minute (00-59)
  • ss: Second (00-59)

Examples

{{date "January 15, 2023" "YYYY-MM-DD"}}


{{date "5 years ago" "YYYY"}}


{{date "next Friday" "MM/DD/YYYY"}}


{{date}}


{{date "2023-01-15" "dd/mm/yyyy"}}

{{moment}}

Legacy alias for {{date}}. Works exactly the same as the date helper.

Example

{{moment "December 25, 2023" "YYYY-MM-DD"}}

Current Time Helpers

{{timestamp}}

Returns the current Unix timestamp in milliseconds.

Example

{{timestamp}}

{{now}}

Returns the current date/time with optional formatting.

Parameters:

  • format (optional): Format string (defaults to "YYYY-MM-DD HH:mm:ss")

Examples

{{now}}


{{now "YYYY-MM-DD"}}


{{now "HH:mm:ss"}}

Relative Time Helpers

{{fromNow}}

Display relative time from now (e.g., "5 minutes ago", "in 2 hours").

Parameters:

  • dateInput: Date string, Date object, or timestamp

Examples

{{fromNow "2 days ago"}}


{{fromNow "tomorrow"}}


{{fromNow "January 1, 2025"}}

{{ago}}

Alias for {{fromNow}}. Shows how long ago a date was.

Example

{{ago "5 minutes ago"}}

{{toNow}}

Opposite of fromNow. Shows relative time to now (less commonly used).

Example

{{toNow "2 hours ago"}}

Date Arithmetic Helpers

{{dateAdd}}

Add time to a date.

Parameters:

  • dateInput (optional): Date to add to (defaults to now)
  • amount: Number to add
  • unit: Unit of time ("year", "month", "week", "day", "hour", "minute", "second")

Examples

{{dateAdd "2023-01-15" 5 "days"}}


{{dateAdd "2023-01-15" 2 "months"}}


{{dateAdd undefined 1 "year"}}

{{dateSubtract}}

Subtract time from a date.

Parameters:

  • dateInput (optional): Date to subtract from (defaults to now)
  • amount: Number to subtract
  • unit: Unit of time

Examples

{{dateSubtract "2023-01-15" 5 "days"}}


{{dateSubtract "2023-01-15" 2 "weeks"}}

Date Period Helpers

{{startOf}}

Get the start of a time period.

Parameters:

  • dateInput (optional): Date (defaults to now)
  • unit: Unit of time ("year", "month", "week", "day", "hour", "minute", "second")

Examples

{{startOf "2023-01-15" "month"}}


{{startOf "2023-06-15" "year"}}


{{startOf "2023-01-15 14:30:45" "day"}}

{{endOf}}

Get the end of a time period.

Parameters:

  • dateInput (optional): Date (defaults to now)
  • unit: Unit of time

Examples

{{endOf "2023-01-15" "month"}}


{{endOf "2023-06-15" "year"}}

Date Comparison Helpers

{{isBefore}}

Check if the first date is before the second date.

Parameters:

  • date1: First date
  • date2: Second date

Returns: true or false

Example

{{#if (isBefore "2023-01-10" "2023-01-15")}}
  Date 1 is before Date 2
{{/if}}

{{isAfter}}

Check if the first date is after the second date.

Parameters:

  • date1: First date
  • date2: Second date

Returns: true or false

Example

{{#if (isAfter "2023-01-20" "2023-01-15")}}
  Date 1 is after Date 2
{{/if}}

{{isSame}}

Check if two dates are the same, with optional unit precision.

Parameters:

  • date1: First date
  • date2: Second date
  • unit (optional): Unit for comparison ("year", "month", "day", etc.)

Returns: true or false

Examples

{{#if (isSame "2023-01-15" "2023-01-15")}}
  Dates are the same
{{/if}}

{{#if (isSame "2023-01-15" "2023-12-31" "year")}}
  Same year
{{/if}}

{{isBetween}}

Check if a date is between two other dates (inclusive).

Parameters:

  • dateInput: Date to check
  • startDate: Start of range
  • endDate: End of range

Returns: true or false

Example

{{#if (isBetween "2023-01-15" "2023-01-10" "2023-01-20")}}
  Date is in range
{{/if}}

Date Utilities

{{diff}}

Calculate the difference between two dates.

Parameters:

  • date1: First date
  • date2: Second date
  • unit (optional): Unit for result ("year", "month", "day", "hour", etc.). Defaults to milliseconds.

Returns: Number

Examples

{{diff "2023-01-20" "2023-01-15" "days"}}


{{diff "2023-03-15" "2023-01-15" "months"}}


{{diff "2025-01-15" "2023-01-15" "years"}}

{{toISOString}}

Convert a date to ISO 8601 format.

Parameters:

  • dateInput: Date to convert

Examples

{{toISOString "2023-01-15"}}


{{toISOString "January 15, 2023"}}

Internationalization Helpers

{{dateTimezone}}

Format a date in a specific timezone.

Parameters:

  • dateInput: Date to format
  • timezone: IANA timezone string (e.g., "America/New_York", "UTC", "Europe/London")
  • format (optional): Format string (defaults to "YYYY-MM-DD HH:mm:ss")

Examples

{{dateTimezone "2023-01-15 12:00:00" "America/New_York" "YYYY-MM-DD HH:mm:ss"}}


{{dateTimezone "2023-01-15" "UTC"}}

{{dateLocale}}

Format a date with a specific locale.

Parameters:

  • dateInput: Date to format
  • locale: Locale code (e.g., "en", "fr", "de")
  • format (optional): Format string (defaults to "YYYY-MM-DD HH:mm:ss")

Example

{{dateLocale "2023-01-15" "en" "YYYY-MM-DD"}}

Natural Language Date Parsing

All date helpers support natural language date parsing powered by chrono-node:

  • "today", "tomorrow", "yesterday"
  • "next Friday", "last Monday"
  • "5 days ago", "in 2 weeks"
  • "January 15, 2023"
  • "2023-01-15"
  • Date objects
  • Unix timestamps

Examples

{{date "tomorrow" "YYYY-MM-DD"}}
{{date "next Friday" "MM/DD/YYYY"}}
{{date "5 years ago" "YYYY"}}
{{fromNow "2 hours ago"}}
{{dateAdd "next week" 3 "days"}}