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formatDuration javascript Code Snippet in 2024

datemathstringintermediate

Last Updated: 11 March 2024

Returns the human-readable format of the given number of milliseconds.

  • Divide ms with the appropriate values to obtain the appropriate values for day, hour, minute, second and millisecond.
  • Use Object.entries() with Array.prototype.filter() to keep only non-zero values.
  • Use Array.prototype.map() to create the string for each value, pluralizing appropriately.
  • Use String.prototype.join(', ') to combine the values into a string.
const formatDuration = ms => { if (ms < 0) ms = -ms; const time = { day: Math.floor(ms / 86400000), hour: Math.floor(ms / 3600000) % 24, minute: Math.floor(ms / 60000) % 60, second: Math.floor(ms / 1000) % 60, millisecond: Math.floor(ms) % 1000 }; return Object.entries(time) .filter(val => val[1] !== 0) .map(([key, val]) => `${val} ${key}${val !== 1 ? 's' : ''}`) .join(', '); };
formatDuration(1001); // '1 second, 1 millisecond' formatDuration(34325055574); // '397 days, 6 hours, 44 minutes, 15 seconds, 574 milliseconds'

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