Fork of Public Dates for TextExpander for international YYYY-MM-DD format

'Citus_lib_for_Dates.js

// This is a fork of the below to get YYYY-MM-DD date formats (to be on the same page with international usage/teams
// How to use:
// 1. Copy the public snippet "Past and Future Dates - Public"
// 2. Rename its 'lib_for_Dates Snippet to something else
// 3. Copy/paste this script's contents there
// 4. Update all the snippets' top line from:
// %snippet:'lib_for_Dates%
//    to:
// %snippet:'Citus_lib_for_Dates%
//    (where 'Citus_lib_for_Dates is what you renamed your snippet to)
// 5. Test to make sure you got all the snippets and they're working as expected.

// ---

// Locale-aware, options-friendly dates snippet group –
// a replacement for the old DatesUS group
//
// Derived from Thought Asylum - Dates group snippet lib_ta_dates
// with permission from and our thanks to Stephen Millard
// See: http://www.thoughtasylum.com/textexpander/

const userDefinedLocale = "%snippet:'locale_for_Dates%";
const userDefinedDateOptions = "%snippet:'options_for_Dates%";

function OriginalGetFormattedDate(date) {
	var locale = undefined;
	var options = { month: '2-digit', day: '2-digit', year: 'numeric'};
	if (userDefinedLocale !== "('locale_for_Dates)" && userDefinedLocale !== "%%snippet:'locale_for_Dates%%") {
		try {
			eval("locale = %snippet:'locale_for_Dates%");
		} catch(err) {
			eval("locale = '%snippet:'locale_for_Dates%'");
		}
	}
	if (userDefinedDateOptions !== "('options_for_Dates)" && userDefinedDateOptions !== "%%snippet:'options_for_Dates%%") {
		eval("options = %snippet:'options_for_Dates%");
	}
	return date.toLocaleString(locale, options);
}

function GetFormattedDate(date) {
	var universalDate = new Date(OriginalGetFormattedDate(date));
  // Credit for converting to YYYY-MM-DD format while respecting time zone:
	// @link https://stackoverflow.com/a/29774197/781824
	var offset = universalDate .getTimezoneOffset();
	universalDate = new Date(universalDate .getTime() - (offset*60*1000));
	return universalDate.toISOString().split('T')[0];
}

function CurrentDateObjectAddDays(p_intDays){
	var objDate = new Date();
	var intDay = 1000 * 60 * 60 * 24;
	objDate.setDate(objDate.getDate() + p_intDays);
	return objDate;
}

function CurrentDateAddDays(p_intDays){
	var objDate = CurrentDateObjectAddDays(p_intDays);
	return GetFormattedDate(objDate);
}

function CurrentDateStampAddDays(p_intDays){
	var objDate = CurrentDateObjectAddDays(p_intDays);
	return GetFormattedDate(objDate);
}

function CurrentDateAddWeeks(p_intWeeks){
	return  CurrentDateAddDays(7 * p_intWeeks);
}

function CurrentDateStampAddWeeks(p_intWeeks){
	return CurrentDateStampAddDays(7 * p_intWeeks);
}

function PrePadZero(p_intInput) {
	return (p_intInput < 10) ? '0' + p_intInput : p_intInput;
}

//Constants for JavaScript days of the week IDs
var CON_DAY_SUN = 0;
var CON_DAY_MON = 1;
var CON_DAY_TUE = 2;
var CON_DAY_WED = 3;
var CON_DAY_THU = 4;
var CON_DAY_FRI = 5;
var CON_DAY_SAT = 6;


//Return the next Monday/Tuesday/Wednesday/etc. after today
function NextDay(p_dtStartDate, p_intDay) {
    var dtFinalDate = new Date(p_dtStartDate||new Date());
    dtFinalDate.setDate(dtFinalDate.getDate() + (p_intDay - 1 - dtFinalDate.getDay() + 7) % 7 + 1);
    return dtFinalDate;
}

//Return the last Monday/Tuesday/Wednesday/etc. before today
function PrevDay(p_dtStartDate, p_intDay) {
	//Move us just over a week back
	var dtModifiedDate = new Date();
	dtModifiedDate.setDate(p_dtStartDate.getDate() - 8);

	//Now add forward
	return NextDay(dtModifiedDate, p_intDay);
}


function GetNextDay(p_intDay){
	var objDate = new Date();
	return NextDay(objDate, p_intDay);
}


function GetPrevDay(p_intDay){
	var objDate = new Date();
	return PrevDay(objDate, p_intDay);
}

function GetNextDayDate(p_intDay){
	return GetFormattedDate(GetNextDay(p_intDay));
}


function GetPrevDayDate(p_intDay){
	return GetFormattedDate(GetPrevDay(p_intDay));
}

function GetNextDayDateStamp(p_intDay){
	return FormatDate_yyyymmdd(GetNextDay(p_intDay));
}


function GetPrevDayDateStamp(p_intDay){
	return FormatDate_yyyymmdd(GetPrevDay(p_intDay));
}

function FormatDate_yyyymmdd(objDate){
	return objDate.getFullYear() + "-" + PrePadZero(objDate.getMonth() + 1) + "-" + PrePadZero(objDate.getDate());
}

function GetWeekDay(p_strDate) {
	//Return day of week from a date string formatted mm/dd/yyyy
	var dtInput = new Date(p_strDate);

	//Hold the days of the week in an array
	var astrWeekDay = new Array(7);
	astrWeekDay[0]=  "Sunday";
	astrWeekDay[1] = "Monday";
	astrWeekDay[2] = "Tuesday";
	astrWeekDay[3] = "Wednesday";
	astrWeekDay[4] = "Thursday";
	astrWeekDay[5] = "Friday";
	astrWeekDay[6] = "Saturday";

	//Read back the day of the week from the array
	return astrWeekDay[dtInput.getDay()];
}