Extract year, month, day, hour, minute, second and millisecond from a date

Split the UTC ISO string into its numeric parts.

JavaScript Version 1.0.0 · MIT · .md

function extract(dateTime) { return new Date(dateTime).toISOString().split(/[^0-9]/).slice(0, -1); }

Input & expected output

"2026-10-28T14:05:09.123Z"

[
  "2026",
  "10",
  "28",
  "14",
  "05",
  "09",
  "123"
]

The edge case

"2026-10-28T23:30:00-03:00"

[
  "2026",
  "10",
  "29",
  "02",
  "30",
  "00",
  "000"
]

Know the limits

• Parts are zero-padded strings in UTC, as in the original; an offset shifts them, as the edge case shows.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Compare two dates — Compare validated ISO calendar dates in UTC and return -1, 0 or 1.
• Add AM PM suffix to an hour — Turn an hour from 0 to 23 into a 12-hour label with am or pm.
• Calculate the number of days between two dates — Count whole calendar days between two YYYY-MM-DD dates.