taro/src/utils/ring_utils.ts

export const startArc = (time: number) => {
    var date = new Date(time);
    var hour = date.getHours();
    var minute = date.getMinutes();
    var second = date.getSeconds();
    return (hour * 3600 + minute * 60 + second) / (24 * 3600) * 2 * Math.PI - Math.PI / 2.0;
}

export const durationArc = (start_time: number, end_time: number) => {
    var duration = (end_time - start_time) / 1000;
    return duration / (24 * 3600) * 2 * Math.PI;
}