isSameDay()
Check if two Date objects represent the same calendar day, regardless of time.
Syntax
typescript
isSameDay(date1, date2)Parameters
| Parameter | Type | Required | Description |
|---|---|---|---|
date1 | Date | Yes | The first Date object to compare |
date2 | Date | Yes | The second Date object to compare |
Returns
boolean - Returns true if both dates are on the same calendar day, false otherwise
Basic Examples
Comparing Calendar Days
typescript
import { isSameDay } from 'date-and-time';
const morning = new Date(2024, 7, 15, 9, 30, 0); // August 15, 2024 09:30:00
const evening = new Date(2024, 7, 15, 18, 45, 30); // August 15, 2024 18:45:30
const nextDay = new Date(2024, 7, 16, 9, 30, 0); // August 16, 2024 09:30:00
console.log(isSameDay(morning, evening)); // true (same day, different times)
console.log(isSameDay(morning, nextDay)); // false (different days)Ignoring Time Components
typescript
const startOfDay = new Date(2024, 7, 15, 0, 0, 0, 0); // August 15, 2024 00:00:00.000
const endOfDay = new Date(2024, 7, 15, 23, 59, 59, 999); // August 15, 2024 23:59:59.999
console.log(isSameDay(startOfDay, endOfDay)); // true
// Even milliseconds don't matter for day comparison
const precise1 = new Date(2024, 7, 15, 12, 30, 45, 123);
const precise2 = new Date(2024, 7, 15, 12, 30, 45, 456);
console.log(isSameDay(precise1, precise2)); // true