X軸の目盛を１時間単位で表示するには、X軸のMajorUnitプロパティに、1時間に相当するOADateの数値を設定します。



以下に簡単な設定例を記載します。

◎サンプルコード（VB）

Imports C1.Chart
Imports C1.Win.Chart

Public Class Form1
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        ' データの作成
        Dim dt As New DataTable()
        With dt
            .Columns.AddRange({New DataColumn("X", GetType(DateTime)), New DataColumn("Y", GetType(Int32))})
            Dim baseTime = DateTime.Today
            Dim rnd = New Random()
            For i = 1 To 12
                dt.Rows.Add(baseTime.AddHours(i), rnd.Next(1, 10))
            Next
            .AcceptChanges()
        End With

        ' シリーズの作成
        Dim series = New Series With {
            .Name = "Series1",
            .Binding = "Y",
            .BindingX = "X",
            .ChartType = ChartType.LineSymbols
        }

        ' チャートの設定
        With FlexChart1
            Text = .ProductVersion
            .Series.Clear()
            .Series.Add(series)
            .DataSource = dt

            ' X軸の設定
            .AxisX.MajorUnit = DateTime.Today.ToOADate() - DateTime.Today.AddHours(-1).ToOADate()
        End With
    End Sub
End Class

◎サンプルコード（C#）

using C1.Chart;
using C1.Win.Chart;

namespace prj_C1FlexChart
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // データの作成
            var dt = new DataTable();
            dt.Columns.AddRange(new[] { new DataColumn("X", typeof(DateTime)), new DataColumn("Y", typeof(int)) });
            var baseTime = DateTime.Today;
            var rnd = new Random();
            for (int i = 1; i <= 12; i++)
                dt.Rows.Add(baseTime.AddHours(i), rnd.Next(1, 10));
            dt.AcceptChanges();

            // シリーズの作成
            var series = new Series()
            {
                Name = "Series1",
                Binding = "Y",
                BindingX = "X",
                ChartType = ChartType.LineSymbols
            };

            // チャートの設定
            {
                var withBlock = flexChart1;
                withBlock.Series.Clear();
                withBlock.Series.Add(series);
                withBlock.DataSource = dt;

                // X軸の設定
                withBlock.AxisX.MajorUnit = DateTime.Today.ToOADate() - DateTime.Today.AddHours(-1).ToOADate();
            }
        }
    }
}