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