Display DateTime as Time Ago (Time since posted) in ASP.Net

Hi micah,

Please refer below sample.

HTML

<asp:Repeater ID="rptDate" runat="server" OnItemDataBound="rptDate_ItemDataBound">
    <HeaderTemplate>
        <table cellspacing="0" rules="all" border="1">
            <tr>
                <th>
                    Date
                </th>
                <th>
                    Message
                </th>
            </tr>
    </HeaderTemplate>
    <ItemTemplate>
        <tr>
            <td>
                <asp:Label ID="lblCountry" runat="server" Text='<%# Eval("Date") %>' />
            </td>
            <td>
                <asp:Label ID="lblMessage" runat="server" Text='<%# Eval("Message") %>' />
            </td>
        </tr>
    </ItemTemplate>
    <FooterTemplate>
        </table>
    </FooterTemplate>
</asp:Repeater>

Namespaces

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[] { new DataColumn("Date", typeof(DateTime)), new DataColumn("Message", typeof(string)) });
    dt.Rows.Add("07/14/2018 11:45");
    dt.Rows.Add("07/16/2018 18:25");
    dt.Rows.Add("06/16/2018 18:25");
    dt.Rows.Add("06/16/2016 18:25");
    rptDate.DataSource = dt;
    rptDate.DataBind();
}
protected void rptDate_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        Label lblDate = (Label)e.Item.FindControl("lblCountry");
        ((Label)e.Item.FindControl("lblMessage")).Text = CalCulateTime(Convert.ToDateTime(lblDate.Text));
    }
}

public string CalCulateTime(DateTime postDate)
{
    string message = "";
    DateTime currentDate = DateTime.Now;
    TimeSpan timegap = currentDate - postDate;
    message = string.Concat("Posted on ", postDate.ToString("MMMM dd, yyyy"), " at ", postDate.ToString("hh:mm tt"));
    if (timegap.Days > 365)
    {
        message = string.Concat("Posted ", (((timegap.Days) / 30) / 12), " years/s ago");
    }
    else if (timegap.Days > 31)
    {
        message = string.Concat("Posted ", ((timegap.Days) / 30), " month/s ago");
    }
    else if (timegap.Days > 1)
    {
        message = string.Concat("Posted ", timegap.Days, " day/s ago");
    }
    else if (timegap.Days == 1)
    {
        message = "Posted yesterday";
    }
    else if (timegap.Hours >= 2)
    {
        message = string.Concat("Posted ", timegap.Hours, " hour/s ago");
    }
    else if (timegap.Hours >= 1)
    {
        message = "Posted an hour ago";
    }
    else if (timegap.Minutes >= 60)
    {
        message = "Posted more than an hour ago";
    }
    else if (timegap.Minutes >= 5)
    {
        message = string.Concat("Posted ", timegap.Minutes, " minute/s ago");
    }
    else if (timegap.Minutes >= 1)
    {
        message = "Posted a few minute/s ago";
    }
    else
    {
        message = "Posted less than a minute ago";
    }

    return message;
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    Dim dt As DataTable = New DataTable()
    dt.Columns.AddRange(New DataColumn() {New DataColumn("Date", GetType(DateTime)), New DataColumn("Message", GetType(String))})
    dt.Rows.Add("07/14/2018 11:45")
    dt.Rows.Add("07/16/2018 18:25")
    dt.Rows.Add("06/16/2018 18:25")
    dt.Rows.Add("06/16/2016 18:25")
    rptDate.DataSource = dt
    rptDate.DataBind()
End Sub

Protected Sub rptDate_ItemDataBound(ByVal sender As Object, ByVal e As RepeaterItemEventArgs)
    If e.Item.ItemType = ListItemType.Item OrElse e.Item.ItemType = ListItemType.AlternatingItem Then
        Dim lblDate As Label = CType(e.Item.FindControl("lblCountry"), Label)
        CType(e.Item.FindControl("lblMessage"), Label).Text = CalCulateTime(Convert.ToDateTime(lblDate.Text))
    End If
End Sub

Public Function CalCulateTime(ByVal postDate As DateTime) As String
    Dim message As String = ""
    Dim currentDate As DateTime = DateTime.Now
    Dim timegap As TimeSpan = currentDate - postDate
    message = String.Concat("Posted on ", postDate.ToString("MMMM dd, yyyy"), " at ", postDate.ToString("hh:mm tt"))
    If timegap.Days > 365 Then
        message = String.Concat("Posted ", (((timegap.Days) / 30) / 12), " years/s ago")
    ElseIf timegap.Days > 31 Then
        message = String.Concat("Posted ", ((timegap.Days) / 30), " month/s ago")
    ElseIf timegap.Days > 1 Then
        message = String.Concat("Posted ", timegap.Days, " day/s ago")
    ElseIf timegap.Days = 1 Then
        message = "Posted yesterday"
    ElseIf timegap.Hours >= 2 Then
        message = String.Concat("Posted ", timegap.Hours, " hour/s ago")
    ElseIf timegap.Hours >= 1 Then
        message = "Posted an hour ago"
    ElseIf timegap.Minutes >= 60 Then
        message = "Posted more than an hour ago"
    ElseIf timegap.Minutes >= 5 Then
        message = String.Concat("Posted ", timegap.Minutes, " minute/s ago")
    ElseIf timegap.Minutes >= 1 Then
        message = "Posted a few minute/s ago"
    Else
        message = "Posted less than a minute ago"
    End If

    Return message
End Function

Screenshot