Run details:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Mobile Safari/537.36
Chrome Mobile 128
Android
Mobile
7 months ago
Test name Executions per second
new Date(dateTimeISO) 911994.1 Ops/sec
new Date(normalizeToLocalDate(dateTimeISO)) 858043.6 Ops/sec
new Date(dateOnlyISO) 1095093.2 Ops/sec
new Date(normalizeToLocalDate(dateOnlyISO)) 730371.9 Ops/sec
Script Preparation code:
x
 
var dateTimeISO = '2024-08-21T17:00:00.000Z'
var dateOnlyISO = '2024-08-21'
var normalizeToLocalDate = (date) =>
    date.length === 10 && /^\d{4}-\d{2}-\d{2}$/.test(date) ? ` ${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))