using System;

namespace DS.Module.Core.Extensions;


public static class DateTimeExtension
{
    /// <summary>
    /// 时间戳起始日期
    /// </summary>
    public static readonly DateTime TimestampStart = new(1970, 1, 1, 0, 0, 0, 0);

    /// <summary>
    /// 转换为时间戳
    /// </summary>
    /// <param name="dateTime"></param>
    /// <param name="milliseconds">是否使用毫秒</param>
    /// <returns></returns>
    public static long ToTimestamp(this DateTime dateTime, bool milliseconds = false)
    {
        var timestamp = dateTime.ToUniversalTime() - TimestampStart;
        return (long)(milliseconds ? timestamp.TotalMilliseconds : timestamp.TotalSeconds);
    }

    /// <summary>
    /// 获取周几
    /// </summary>
    /// <param name="datetime"></param>
    /// <returns></returns>
    public static string GetWeekName(this DateTime datetime)
    {
        var day = (int)datetime.DayOfWeek;
        var week = new string[] { "周日", "周一", "周二", "周三", "周四", "周五", "周六" };
        return week[day];
    }
}