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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.import { assert } from "../testing/asserts.ts";
export type DateFormat = "mm-dd-yyyy" | "dd-mm-yyyy" | "yyyy-mm-dd";
function execForce(reg: RegExp, pat: string): RegExpExecArray {  const v = reg.exec(pat);  assert(v != null);  return v;}/** * Parse date from string using format string * @param dateStr Date string * @param format Format string * @return Parsed date */export function parseDate(dateStr: string, format: DateFormat): Date {  let m, d, y: string;  let datePattern: RegExp;
  switch (format) {    case "mm-dd-yyyy":      datePattern = /^(\d{2})-(\d{2})-(\d{4})$/;      [, m, d, y] = execForce(datePattern, dateStr);      break;    case "dd-mm-yyyy":      datePattern = /^(\d{2})-(\d{2})-(\d{4})$/;      [, d, m, y] = execForce(datePattern, dateStr);      break;    case "yyyy-mm-dd":      datePattern = /^(\d{4})-(\d{2})-(\d{2})$/;      [, y, m, d] = execForce(datePattern, dateStr);      break;    default:      throw new Error("Invalid date format!");  }
  return new Date(Number(y), Number(m) - 1, Number(d));}
export type DateTimeFormat =  | "mm-dd-yyyy hh:mm"  | "dd-mm-yyyy hh:mm"  | "yyyy-mm-dd hh:mm"  | "hh:mm mm-dd-yyyy"  | "hh:mm dd-mm-yyyy"  | "hh:mm yyyy-mm-dd";
/** * Parse date & time from string using format string * @param dateStr Date & time string * @param format Format string * @return Parsed date */export function parseDateTime(  datetimeStr: string,  format: DateTimeFormat): Date {  let m, d, y, ho, mi: string;  let datePattern: RegExp;
  switch (format) {    case "mm-dd-yyyy hh:mm":      datePattern = /^(\d{2})-(\d{2})-(\d{4}) (\d{2}):(\d{2})$/;      [, m, d, y, ho, mi] = execForce(datePattern, datetimeStr);      break;    case "dd-mm-yyyy hh:mm":      datePattern = /^(\d{2})-(\d{2})-(\d{4}) (\d{2}):(\d{2})$/;      [, d, m, y, ho, mi] = execForce(datePattern, datetimeStr);      break;    case "yyyy-mm-dd hh:mm":      datePattern = /^(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2})$/;      [, y, m, d, ho, mi] = execForce(datePattern, datetimeStr);      break;    case "hh:mm mm-dd-yyyy":      datePattern = /^(\d{2}):(\d{2}) (\d{2})-(\d{2})-(\d{4})$/;      [, ho, mi, m, d, y] = execForce(datePattern, datetimeStr);      break;    case "hh:mm dd-mm-yyyy":      datePattern = /^(\d{2}):(\d{2}) (\d{2})-(\d{2})-(\d{4})$/;      [, ho, mi, d, m, y] = execForce(datePattern, datetimeStr);      break;    case "hh:mm yyyy-mm-dd":      datePattern = /^(\d{2}):(\d{2}) (\d{4})-(\d{2})-(\d{2})$/;      [, ho, mi, y, m, d] = execForce(datePattern, datetimeStr);      break;    default:      throw new Error("Invalid datetime format!");  }
  return new Date(Number(y), Number(m) - 1, Number(d), Number(ho), Number(mi));}
/** * Get number of the day in the year * @return Number of the day in year */export function dayOfYear(date: Date): number {  const dayMs = 1000 * 60 * 60 * 24;  const yearStart = new Date(date.getFullYear(), 0, 0);  const diff =    date.getTime() -    yearStart.getTime() +    (yearStart.getTimezoneOffset() - date.getTimezoneOffset()) * 60 * 1000;  return Math.floor(diff / dayMs);}
/** * Get number of current day in year * @return Number of current day in year */export function currentDayOfYear(): number {  return dayOfYear(new Date());}
/** * Parse a date to return a IMF formated string date * RFC: https://tools.ietf.org/html/rfc7231#section-7.1.1.1 * IMF is the time format to use when generating times in HTTP * headers. The time being formatted must be in UTC for Format to * generate the correct format. * @param date Date to parse * @return IMF date formated string */export function toIMF(date: Date): string {  function dtPad(v: string, lPad = 2): string {    return v.padStart(lPad, "0");  }  const d = dtPad(date.getUTCDate().toString());  const h = dtPad(date.getUTCHours().toString());  const min = dtPad(date.getUTCMinutes().toString());  const s = dtPad(date.getUTCSeconds().toString());  const y = date.getUTCFullYear();  const days = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];  const months = [    "Jan",    "Feb",    "Mar",    "Apr",    "May",    "Jun",    "Jul",    "Aug",    "Sep",    "Oct",    "Nov",    "Dec",  ];  return `${days[date.getUTCDay()]}, ${d} ${    months[date.getUTCMonth()]  } ${y} ${h}:${min}:${s} GMT`;}