function Clock() {
    GC.Spread.Sheets.Sparklines.SparklineEx.call(this);
 }
 Clock.prototype = new GC.Spread.Sheets.Sparklines.SparklineEx();
 Clock.prototype.createFunction = function () {
     var func = new GC.Spread.CalcEngine.Functions.Function("CLOCK", 1, 1);
     func.evaluate = function (args) {
         return args[0];
     };
                return func;
            };
            Clock.prototype._drawCircle = function (context, centerX, centerY, radius) {
                context.beginPath();
                context.arc(centerX, centerY, radius, 0, Math.PI * 2, true);
                context.stroke();
            };
            Clock.prototype._drawCenter = function (context, centerX, centerY, radius) {
                context.beginPath();
                context.arc(centerX, centerY, radius, 0, Math.PI * 2, true);
                context.fill();
            };
            Clock.prototype._drawHand = function (context, centerX, centerY, loc, radius) {
                var angle = (Math.PI * 2) * (loc / 60) - Math.PI / 2;
                context.beginPath();
                context.moveTo(centerX, centerY);
                context.lineTo(centerX + Math.cos(angle) * radius, centerY + Math.sin(angle) * radius);
                context.stroke();
            };
            Clock.prototype._drawHands = function (context, value, centerX, centerY, radius) {
                var date = value, hour = date.getHours();
                hour = hour > 12 ? hour - 12 : hour;
                this._drawHand(context, centerX, centerY, hour * 5 + (date.getMinutes() / 60) * 5, radius / 2);
                this._drawHand(context, centerX, centerY, date.getMinutes(), radius * 3 / 4);
                context.strokeStyle = "red";
                this._drawHand(context, centerX, centerY, date.getSeconds(), radius * 3 / 4);

            };
            Clock.prototype._drawNumerals = function (context, centerX, centerY, radius) {
                var numerals = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12],
                    angle,
                    numeralWidth;
                if (radius > 0) {
                    numerals.forEach(function (numeral) {
                        angle = Math.PI / 6 * (numeral - 3);
                        numeralWidth = context.measureText(numeral).width;
                        context.beginPath();
                        context.fillText(numeral, centerX + Math.cos(angle) * radius + numeralWidth / 2, centerY +     Math.sin(angle) * radius + numeralWidth / 2);
                    });
                }
            };
            Clock.prototype.paint = function (context, value, x, y, width, height) {
                if (!(value instanceof Date)) {
                    return;
                }
                var centerX = x + width / 2,
                    centerY = y + height / 2,
                    margin = 10,
                    padding = 10,
                    radius = Math.min(width, height) / 2 - margin;
                if (radius <= 0) {
                    return;
                }
                context.save();

                // 円を描画
                this._drawCircle(context, centerX, centerY, radius);
                // 中心点を描画
                this._drawCenter(context, centerX, centerY, 3);
                // 針を描画
                this._drawHands(context, value, centerX, centerY, radius);
                // 数字を描画
                this._drawNumerals(context, centerX, centerY, radius - padding);

                context.restore();
            };
            spread.addSparklineEx(new Clock());

            var sheet = spread.getActiveSheet();

 var style = new GC.Spread.Sheets.Style();
 style.hAlign = GC.Spread.Sheets.HorizontalAlign.center;
 style.vAlign = GC.Spread.Sheets.VerticalAlign.center;
 sheet.setDefaultStyle(style);
 sheet.getCell(0, 1, GC.Spread.Sheets.SheetArea.viewport).value("Universal Time").font("20px Arial");
 sheet.setValue(1, 0, "Beijing");
 sheet.setValue(1, 1, "Tokyo");
 sheet.setValue(1, 2, "New York");
 sheet.setFormula(2, 0, '=CLOCK(A4)');
 sheet.setFormula(2, 1, '=CLOCK(B4)');
 sheet.setFormula(2, 2, '=CLOCK(C4)');
 sheet.getRange(3, -1, 1, -1, GC.Spread.Sheets.SheetArea.viewport).formatter("hh:mm:ss tt");
 sheet.setRowHeight(0, 50);
 sheet.setRowHeight(2, 200);
 sheet.setColumnWidth(0, 200);
 sheet.setColumnWidth(1, 200);
 sheet.setColumnWidth(2, 200);
 function updateTime() {
     var now = new Date();
     var utcNow = new Date(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate(), now.getUTCHours(), now.getUTCMinutes(), now.getUTCSeconds(), now.getUTCMilliseconds());
     sheet.setValue(3, 0, new Date(utcNow.setHours(utcNow.getHours() + 8)));//+8
     sheet.setValue(3, 1, new Date(utcNow.setHours(utcNow.getHours() + 1)));//+9
     sheet.setValue(3, 2, new Date(utcNow.setHours(utcNow.getHours() - 14)));//-5
 }
 setInterval(updateTime, 1000);
 updateTime();