adhan-extended/lib/esm/DateUtils.js

High precision Islamic prayer time library (extended)

import Astronomical from './Astronomical';
import { Rounding } from './Rounding';
export function dateByAddingDays(date, days) {
  let result = new Date(date.getTime());
  result.setDate(date.getDate() + days);

  if (days !== 0) {
    while (result.toDateString() === date.toDateString()) {
      // this is for tricky daylight savings
      result = new Date(result.valueOf() + days / Math.abs(days) * (60 * 60 * 1000));
    }
  }

  return result;
}
export function dateByAddingMinutes(date, minutes) {
  return dateByAddingSeconds(date, minutes * 60);
}
export function dateByAddingSeconds(date, seconds) {
  return new Date(date.getTime() + seconds * 1000);
}
export function roundedMinute(date, rounding = Rounding.Nearest) {
  const seconds = date.getUTCSeconds();
  let offset = seconds >= 30 ? 60 - seconds : -1 * seconds;

  if (rounding === Rounding.Up) {
    offset = 60 - seconds;
  } else if (rounding === Rounding.None) {
    offset = 0;
  }

  return dateByAddingSeconds(date, offset);
}
export function dayOfYear(date) {
  let returnedDayOfYear = 0;
  const feb = Astronomical.isLeapYear(date.getFullYear()) ? 29 : 28;
  const months = [31, feb, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

  for (let i = 0; i < date.getMonth(); i++) {
    returnedDayOfYear += months[i];
  }

  returnedDayOfYear += date.getDate();
  return returnedDayOfYear;
}
export function isValidDate(date) {
  return date instanceof Date && !isNaN(date.valueOf());
}
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