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88 lines
2.8 KiB
TypeScript
88 lines
2.8 KiB
TypeScript
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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export type DateFormat = "mm-dd-yyyy" | "dd-mm-yyyy" | "yyyy-mm-dd";
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/**
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* Parse date from string using format string
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*
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* @param {string} dateStr - date string
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* @param {DateFormat} format - format string
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* @return {Date} Parsed date
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*/
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export function parseDate(dateStr: string, format: DateFormat): Date {
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let m, d, y: string;
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if (format === "mm-dd-yyyy") {
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const datePattern = /^(\d{2})-(\d{2})-(\d{4})$/;
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[, m, d, y] = datePattern.exec(dateStr);
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} else if (format === "dd-mm-yyyy") {
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const datePattern = /^(\d{2})-(\d{2})-(\d{4})$/;
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[, d, m, y] = datePattern.exec(dateStr);
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} else if (format === "yyyy-mm-dd") {
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const datePattern = /^(\d{4})-(\d{2})-(\d{2})$/;
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[, y, m, d] = datePattern.exec(dateStr);
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} else {
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throw new Error("Invalid date format!");
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}
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return new Date(Number(y), Number(m) - 1, Number(d));
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}
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export type DateTimeFormat =
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| "mm-dd-yyyy hh:mm"
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| "dd-mm-yyyy hh:mm"
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| "yyyy-mm-dd hh:mm"
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| "hh:mm mm-dd-yyyy"
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| "hh:mm dd-mm-yyyy"
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| "hh:mm yyyy-mm-dd";
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/**
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* Parse date & time from string using format string
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*
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* @param {string} dateStr - date & time string
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* @param {DateTimeFormat} format - format string
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* @return {Date} Parsed date
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*/
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export function parseDateTime(
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datetimeStr: string,
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format: DateTimeFormat
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): Date {
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let m, d, y, ho, mi: string;
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if (format === "mm-dd-yyyy hh:mm") {
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const datePattern = /^(\d{2})-(\d{2})-(\d{4}) (\d{2}):(\d{2})$/;
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[, m, d, y, ho, mi] = datePattern.exec(datetimeStr);
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} else if (format === "dd-mm-yyyy hh:mm") {
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const datePattern = /^(\d{2})-(\d{2})-(\d{4}) (\d{2}):(\d{2})$/;
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[, d, m, y, ho, mi] = datePattern.exec(datetimeStr);
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} else if (format === "yyyy-mm-dd hh:mm") {
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const datePattern = /^(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2})$/;
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[, y, m, d, ho, mi] = datePattern.exec(datetimeStr);
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} else if (format === "hh:mm mm-dd-yyyy") {
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const datePattern = /^(\d{2}):(\d{2}) (\d{2})-(\d{2})-(\d{4})$/;
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[, ho, mi, m, d, y] = datePattern.exec(datetimeStr);
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} else if (format === "hh:mm dd-mm-yyyy") {
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const datePattern = /^(\d{2}):(\d{2}) (\d{2})-(\d{2})-(\d{4})$/;
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[, ho, mi, d, m, y] = datePattern.exec(datetimeStr);
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} else if (format === "hh:mm yyyy-mm-dd") {
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const datePattern = /^(\d{2}):(\d{2}) (\d{4})-(\d{2})-(\d{2})$/;
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[, ho, mi, y, m, d] = datePattern.exec(datetimeStr);
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} else {
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throw new Error("Invalid datetime format!");
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}
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return new Date(Number(y), Number(m) - 1, Number(d), Number(ho), Number(mi));
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}
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/**
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* Get number of current day in year
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*
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* @return {number} Number of current day in year
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*/
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export function currentDayOfYear(): number {
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return (
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Math.ceil(new Date().getTime() / 86400000) -
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Math.floor(
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new Date().setFullYear(new Date().getFullYear(), 0, 1) / 86400000
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)
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);
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}
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