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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
export type DateFormat = "mm-dd-yyyy" | "dd-mm-yyyy" | "yyyy-mm-dd";
/**
* Parse date from string using format string
*
* @param {string} dateStr - date string
* @param {DateFormat} format - format string
* @return {Date} 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})$/;
[, m, d, y] = datePattern.exec(dateStr)!;
break;
case "dd-mm-yyyy":
datePattern = /^(\d{2})-(\d{2})-(\d{4})$/;
[, d, m, y] = datePattern.exec(dateStr)!;
break;
case "yyyy-mm-dd":
datePattern = /^(\d{4})-(\d{2})-(\d{2})$/;
[, y, m, d] = datePattern.exec(dateStr)!;
break;
default:
throw new Error("Invalid date format!");
}
return new Date(Number(y), Number(m) - 1, Number(d));
}
export type DateTimeFormat =
| "mm-dd-yyyy hh:mm"
| "dd-mm-yyyy hh:mm"
| "yyyy-mm-dd hh:mm"
| "hh:mm mm-dd-yyyy"
| "hh:mm dd-mm-yyyy"
| "hh:mm yyyy-mm-dd";
/**
* Parse date & time from string using format string
*
* @param {string} dateStr - date & time string
* @param {DateTimeFormat} format - format string
* @return {Date} Parsed date
*/
export function parseDateTime(
datetimeStr: string,
format: DateTimeFormat
): Date {
let m, d, y, ho, mi: string;
let datePattern: RegExp;
switch (format) {
case "mm-dd-yyyy hh:mm":
datePattern = /^(\d{2})-(\d{2})-(\d{4}) (\d{2}):(\d{2})$/;
[, m, d, y, ho, mi] = datePattern.exec(datetimeStr)!;
break;
case "dd-mm-yyyy hh:mm":
datePattern = /^(\d{2})-(\d{2})-(\d{4}) (\d{2}):(\d{2})$/;
[, d, m, y, ho, mi] = datePattern.exec(datetimeStr)!;
break;
case "yyyy-mm-dd hh:mm":
datePattern = /^(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2})$/;
[, y, m, d, ho, mi] = datePattern.exec(datetimeStr)!;
break;
case "hh:mm mm-dd-yyyy":
datePattern = /^(\d{2}):(\d{2}) (\d{2})-(\d{2})-(\d{4})$/;
[, ho, mi, m, d, y] = datePattern.exec(datetimeStr)!;
break;
case "hh:mm dd-mm-yyyy":
datePattern = /^(\d{2}):(\d{2}) (\d{2})-(\d{2})-(\d{4})$/;
[, ho, mi, d, m, y] = datePattern.exec(datetimeStr)!;
break;
case "hh:mm yyyy-mm-dd":
datePattern = /^(\d{2}):(\d{2}) (\d{4})-(\d{2})-(\d{2})$/;
[, ho, mi, y, m, d] = datePattern.exec(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} Number of the day in year
*/
export function dayOfYear(date: Date): any {
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} Number of current day in year
*/
export function currentDayOfYear(): number {
return dayOfYear(new Date());
}
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