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src/NSExt/Extensions/DateTimeExtensions.cs

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+// ReSharper disable UnusedMember.Global
+
+namespace NSExt.Extensions;
+
+public static class DateTimeExtensions
+{
+    /// <summary>
+    ///     将一个过去时间对象与当前时间相减转换成“xx以前”的字符串，如2秒以前，3天以前
+    /// </summary>
+    /// <param name="me">时间对象</param>
+    /// <returns>字符串</returns>
+    public static string TimeAgo(this DateTime me)
+    {
+        var ts = DateTime.Now - me;
+        if (ts.Days > 0) return ts.Days + "天前";
+
+        if (ts.Hours > 0) return ts.Hours + "小时前";
+
+        if (ts.Minutes > 0) return ts.Minutes + "分钟前";
+
+        return ts.Seconds + "秒前";
+    }
+
+
+    /// <summary>
+    ///     指定时间的世界协调时的unix时间戳形式
+    /// </summary>
+    /// <param name="me">指定时间</param>
+    /// <returns>unix时间戳</returns>
+    public static long TimeUnixUtc(this DateTime me)
+    {
+        return (me.ToUniversalTime().Ticks - 621355968000000000) / 10000000;
+    }
+
+    /// <summary>
+    ///     指定时间的世界协调时的unix时间戳形式（毫秒）
+    /// </summary>
+    /// <param name="me"></param>
+    /// <returns></returns>
+    public static long TimeUnixUtcMs(this DateTime me)
+    {
+        return (me.ToUniversalTime().Ticks - 621355968000000000) / 10000;
+    }
+
+
+    // ReSharper disable once InconsistentNaming
+    public static string yyyyMM(this DateTime me)
+    {
+        return me.ToString("yyyyMM");
+    }
+
+    // ReSharper disable once InconsistentNaming
+    public static string yyyyMMdd(this DateTime me)
+    {
+        return me.ToString("yyyyMMdd");
+    }
+
+
+    // ReSharper disable once InconsistentNaming
+    public static string yyyy_MM(this DateTime me)
+    {
+        return me.ToString("yyyy-MM");
+    }
+
+    // ReSharper disable once InconsistentNaming
+    public static string yyyy_MM_dd(this DateTime me)
+    {
+        return me.ToString("yyyy-MM-dd");
+    }
+
+    // ReSharper disable once InconsistentNaming
+    public static string yyyy_MM_dd_HH_mm(this DateTime me)
+    {
+        return me.ToString("yyyy-MM-dd HH:mm");
+    }
+
+
+    // ReSharper disable once InconsistentNaming
+    public static string yyyy_MM_dd_HH_mm_ss(this DateTime me)
+    {
+        return me.ToString("yyyy-MM-dd HH:mm:ss");
+    }
+
+    // ReSharper disable once InconsistentNaming
+    public static string yyyy_MM_dd_HH_mm_ss_fff(this DateTime me)
+    {
+        return me.ToString("yyyy-MM-dd HH:mm:ss.fff");
+    }
+}