arquero/src/util/is-exact-utc-date.js

Query processing and transformation of array-backed data tables.

export function isExactUTCDate(d) {
  return d.getUTCHours() === 0
    && d.getUTCMinutes() === 0
    && d.getUTCSeconds() === 0
    && d.getUTCMilliseconds() === 0;
}