newswriter/js/datetime.js

NewsWriter is a generic tool for maintaining news and announcements on a website news page. Details are held in an SQLite database, from which the tool generates the index page (typically the top page of the target site), individual pages for events and a

/*
 * Parsing utilities
 */
function extractDate(str) {
    var ret = {};
    var m = str.match(/^([0-9]{4})-([0-9]{1,2})-([0-9]{1,2})$/);
    ret.year = parseInt(m[1],10);
    ret.month = (parseInt(m[2],10)-1);
    ret.day = parseInt(m[3],10);
    return ret;
};

function extractTime(str) {
    var ret = {};
    var m = str.match(/^([0-9]+):([0-9]+)$/);
    ret.hour = m[1];
    ret.minute = m[2];
    return ret;
};

function extractTimeFromIndex(idx) {
    var ret = {};
    ret.hour = Math.floor(((idx-1)/4)+8);
    ret.minute = (((idx-1)%4)*15);
    return ret;
};

function inferUiDate (jsEpoch) {
    var jsDate = new Date(jsEpoch);
    return (jsDate.getFullYear() + '-' + (jsDate.getMonth()+1) + '-' + jsDate.getDate());
};

function inferUiTimeIndex (jsEpoch) {
    // Set from JST
    jsEpoch = jsEpoch + 32400000;
    var jsDate = new Date(jsEpoch);
    // Not actually UTC, but same difference
    var hours = jsDate.getUTCHours();
    var minutes = jsDate.getUTCMinutes();
    // Why the offset of one unit here? I guess selectedIndex starts from 1?
    var timeIndex = ((((hours - 8) * 60) + minutes)/15)+1;
    return timeIndex;
};


/*
 * Convert on read from API
 */

function jsEpochFromUNIX (unixEpoch) {
    return (unixEpoch*1000);
};

function serverDateToClient (unixEpoch) {
    return jsEpochFromUNIX(unixEpoch);
};

function convertDatesToLocal(data) {
    var dateKeys = {
        touchDate:true,
        uploadDate:true,
        startDateTime:true,
        endDateTime:true,
        pageDate:true
    }
    for (var key in data) {
        if (dateKeys[key] && data[key]) {
            data[key] = serverDateToClient(data[key]);
        }
    }
};

function convertAllDatesToLocal(data) {
    convertDatesToLocal(data);
    var segments = ['attachments','sessions'];
    for (var i=0,ilen=segments.length;i<ilen;i+=1) {
        var segment = segments[i];
        if (data[segment] && data[segment].length) {
            for (var j=0,jlen=data[segment].length;j<jlen;j+=1) {
                var obj = data[segment][j];
                convertDatesToLocal(obj);
            }
        }
    }
    
};

/*
 * Convert for write to API
 */

function unixEpochFromJS (jsEpoch) {
    return (jsEpoch/1000);
};

function clientDateToServer (jsEpoch) {
    return unixEpochFromJS(jsEpoch);
};

function convertDatesToRemote(data) {
    var dateKeys = {
        touchDate:true,
        uploadDate:true,
        startDateTime:true,
        endDateTime:true,
        pageDate:true
    }
    for (var key in data) {
        if (dateKeys[key] && data[key]) {
            data[key] = clientDateToServer(data[key]);
        }
    }
};

function convertAllDatesToRemote(data) {
    convertDatesToRemote(data);
    var segments = ['attachments','sessions'];
    for (var i=0,ilen=segments.length;i<ilen;i+=1) {
        var segment = segments[i];
        if (data[segment] && data[segment].length) {
            for (var j=0,jlen=data[segment].length;j<jlen;j+=1) {
                var obj = data[segment][j];
                convertDatesToRemote(obj);
            }
        }
    }
    
};



/*
 * Apply time adjustment (so that times chosen in UI
 * when outside JST are registered as JST times).
 */

function jstShift (date) {
    var relativeOffset = (date.getTimezoneOffset() * 60 * 1000) - (-32400000);
    var utcEpoch = date.getTime();
    return (utcEpoch - relativeOffset);
};