MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

$(function() {
    var ascStartDate = new Date (1999, 7, 6);
    var anStartDate = new Date (1880, 1, 8);
    var months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
    var anMonths = ['I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VII', 'IX', 'X', 'XI', 'XII', 'XIII', 'XIV', 'XV'];

    function monthDiff(d1, d2) {
        return (d2.getFullYear() - d1.getFullYear()) * 12 + d2.getMonth() - d1.getMonth();
    }
     
    function midnight(date) {
        date.setHours(0);
        date.setMinutes(0);
        date.setSeconds(0);
        date.setMilliseconds(0);
	return date;
    }

    function dateToAsc(date)
    {
    	return (Math.floor((date - ascStartDate) / 86400000));
    }

    function ascToDate(ascYear)
    {
        var date = new Date(ascStartDate.getTime() + (ascYear + 1) * 86400000);
	midnight(date);
        return date;
    }
    function dateToAn(date)
    {
        return {year: monthDiff(anStartDate, date) + 1,
		month: Math.floor((date.getDate() - 1) / 2),
		period: (date.getDate() - 1) % 2
	       };
    }

    function anYearTitle(anYear) {
        var dateOfAnYearStart = midnight(new Date(anStartDate.getFullYear() + anYear / 12, anYear % 12, 1));
        var dateOfAnYearEnd = midnight(new Date(anStartDate.getFullYear() + anYear / 12, anYear % 12 + 1, -1));
	return months[dateOfAnYearStart.getMonth()] + ' ' + dateOfAnYearStart.getFullYear() + ', or ' + dateToAsc(dateOfAnYearStart) + ' - ' + dateToAsc(dateOfAnYearEnd) + ' ASC';
    }

    function ascYearTitle(ascYear) {
	var date = ascToDate(ascYear);
	var anDate = dateToAn(date);

        return date.toLocaleDateString() + ', or ' + anMonths[anDate.month] + '.' + anDate.year + ' ' + (anDate.period == 0 ? '(1..12)' : '(13..24)');
    }
     
    $('.micraswiki-an-year').each(function() {
        var $this = $(this);
        var year = parseInt($this.data('an-year') == undefined ? $this.html() : $this.data('an-year'));
        if (year != undefined) {
            $this.wrap($('<abbr title="' + anYearTitle(year) + '" />'));
        }
    });

    $('.micraswiki-asc-year').each(function() {
	var $this = $(this);
	var year = parseInt($this.data('asc-year') == undefined ? $this.html() : $this.data('asc-year'));
	if (year != undefined) {
            $this.wrap($('<abbr title="' + ascYearTitle(year) + '" />'));
	}
    });  
});