Run results for: new Date(date) vs new Date(normalizeToLocalDate(date)) 2

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 127

Operating system: Android

Device Platform: Mobile

Date tested: 4 months ago

Test name	Executions per second
new Date(dateTimeISO)	1617068.8 Ops/sec
new Date(normalizeToLocalDate(dateTimeISO))	1475082.5 Ops/sec
new Date(dateOnlyISO)	2105175.5 Ops/sec
new Date(normalizeToLocalDate(dateOnlyISO))	986165.4 Ops/sec

Script Preparation code:

var dateTimeISO = '2024-08-21T17:00:00.000Z'
var dateOnlyISO = '2024-08-21'

var normalizeToLocalDate = (date) => ` ${date}`

Tests:

new Date(dateTimeISO)
new Date(dateTimeISO)
new Date(normalizeToLocalDate(dateTimeISO))
new Date(normalizeToLocalDate(dateTimeISO))
new Date(dateOnlyISO)
new Date(dateOnlyISO)
new Date(normalizeToLocalDate(dateOnlyISO))
new Date(normalizeToLocalDate(dateOnlyISO))