yrjw.CommonToolsCore/Extensions/DateTimeExtensions.cs

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using yrjw.CommonToolsCore.Helper;

namespace System
{
    public static class DateTimeExtensions
    {
        /// <summary>
        /// 日期格式化
        /// </summary>
        /// <param name="dateTime"></param>
        /// <param name="format">默认：yyyy-MM-dd HH:mm:ss</param>
        /// <returns></returns>
        public static string Format(this DateTime dateTime, string format = null)
        {
            if (format.IsNull())
                format = "yyyy-MM-dd HH:mm:ss";

            return dateTime.ToString(format);
        }

        /// <summary>
        /// 转换为日期字符串
        /// </summary>
        /// <param name="dateTime"></param>
        /// <returns></returns>
        public static string ToDate(this DateTime dateTime)
        {
            return dateTime.ToString("yyyy-MM-dd");
        }

        /// <summary>
        /// 转换为日期时间字符串
        /// </summary>
        /// <param name="dateTime"></param>
        /// <returns></returns>
        public static string ToDateTime(this DateTime dateTime)
        {
            return dateTime.ToString("yyyy-MM-dd HH:mm:ss");
        }

        /// <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 ts = dateTime.ToUniversalTime() - DateTimeHelper.TimestampStart;
            return (long)(milliseconds ? ts.TotalMilliseconds : ts.TotalSeconds);
        }

        /// <summary>
        /// 获取周几
        /// </summary>
        /// <param name="datetime"></param>
        /// <returns></returns>
        public static string GetWeek(this DateTime datetime)
        {
            var dayOfWeek = datetime.DayOfWeek.ToInt();