Edit in JSFiddle

var canvasWidth;
var canvasHeight;
var interval = 350;
var angleInDegrees = 0;

function init() {
    canvas = document.getElementById("canvas");
    ctx = canvas.getContext('2d');
    canvasWidth = canvas.width;
    canvasHeight = canvas.height;

    setInterval(function () {
        redraw();
    }, interval);
}

init();


function redraw() {

    angleInDegrees += 5;

    ctx.clearRect(0, 0, canvasWidth, canvasHeight);

    ctx.beginPath();
    ctx.rect(200, 150, 5, 5);
    ctx.fill();

    ctx.save();

    ctx.translate(200, 150);
    ctx.rotate(angleInDegrees * Math.PI / 180);

    ctx.fillStyle = '#f00';
    ctx.font = '40px san-serif';
    ctx.textBaseline = 'top';
    ctx.fillText("Hello rotated", 0, 0);

    ctx.restore();

    ctx.fillStyle = '#f00';
    ctx.font = '40px san-serif';
    ctx.textBaseline = 'top';
    ctx.fillText("Hello still", 0, 0);
}

<canvas id="canvas" width=500 height=300></canvas>

        body {
            background-color: ivory;
        }
        canvas {
            border:1px solid red;
        }