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isRelativeDay ​

Checks if a given date is "yesterday" or "tomorrow" relative to the current date.

Note: This function compares only the year, month, and day. Time of day is ignored. Invalid dates will return false.

Parameters ​

  • date (Date): The date to evaluate.
  • dayType ('yesterday' | 'tomorrow'): The relative day type to check against.

Returns ​

  • boolean: true if the date matches the specified relative day (yesterday or tomorrow), otherwise false.

Usage ​

ts
isRelativeDay(new Date(), 'yesterday'); 
// false (today is not yesterday)

const yesterday = new Date();
yesterday.setDate(yesterday.getDate() - 1);
isRelativeDay(yesterday, 'yesterday'); 
// true

const tomorrow = new Date();
tomorrow.setDate(tomorrow.getDate() + 1);
isRelativeDay(tomorrow, 'tomorrow'); 
// true

isRelativeDay(new Date('invalid'), 'tomorrow'); 
// false (invalid date)