Benchmark: Intl.DateTimeFormat vs Reduce/Replace Format

Script Preparation code:

var date = new Date(2021, 2, 24)

var formatDateByIntlDateTimeFormat = (date) => {
  return new Intl.DateTimeFormat('pt-BR').format(date)
}

var tokens = {
  // Padded day       = 01, 02, ..., 31
  DD: (date) => date.getDate().toString().padStart(2, '0'),
  // Padded month     = 01, 02, ..., 12
  MM: (date) => (date.getMonth() + 1).toString().padStart(2, '0'),
  // Padded year      = 0001, 0002, ..., 1995, ..., 2020, 2021
  YYYY: (date) => date.getFullYear().toString().padStart(4, '0'),
};

var formatDateByReduceReplace = (date, format = 'DD/MM/YYYY') => {
  return Object.entries(tokens).reduce(
    (result, [pattern, fn]) => result.replace(new RegExp(pattern, 'g'), fn(date)),
    format
  );
};

Tests:

Intl.DateTimeFormat
formatDateByIntlDateTimeFormat(date)
Reduce/Replace Format
formatDateByReduceReplace(date, 'DD/MM/YYYY')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Intl.DateTimeFormat
Reduce/Replace Format

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4399.0 Safari/537.36

Browser/OS: Chrome 90 on Windows

View result in a separate tab

Test name	Executions per second
Intl.DateTimeFormat	4394.2 Ops/sec
Reduce/Replace Format	253939.7 Ops/sec

Intl.DateTimeFormat vs Reduce/Replace Format (version: 0)

Comparing performance of: Intl.DateTimeFormat vs Reduce/Replace Format

Created: 3 years ago by: Guest

Jump to the latest result

Intl.DateTimeFormat

Reduce/Replace Format

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A