Private Sub Form_Load()
    '控制界面大小
    Me.Height = 5820
    Me.Width = 7080
End Sub

Private Sub Label_calculate_Click()
'时间机算按钮
    '清空时间记录
    Label.Caption = ""
    '判断输入框的多种情况
    If Text_bTime.Text = "" And Text_sTime.Text = "" Then
        MsgBox "您还没有输入时间，请输入时间！"
        '把光标移到开始时间的输入框
        Text_bTime.SetFocus
    ElseIf Text_bTime.Text = "" And Text_sTime.Text <> "" Then
        If IsDate(Text_sTime.Text) = True Then
            MsgBox "您还没有输入开始时间，请输入！"
            '把光标移到开始时间的输入框
            Text_bTime.SetFocus
        Else
            MsgBox "您还没有输入开始时间，请输入！并且截止时间格式错误，格式为：" & Now
            Text_bTime.SetFocus
            Text_sTime.Text = ""
        End If
    ElseIf Text_bTime.Text <> "" And Text_sTime.Text = "" Then
        If IsDate(Text_bTime.Text) = False Then
            MsgBox "您输入的开始时间不是时间格式，请输入时间格式,格式为：" & Now
            '清空输入框
            Text_bTime.Text = ""
            '把光标移到开始时间的输入框
            Text_bTime.SetFocus
        Else
            MsgBox "您没有输入截止时间，默认此时为截止时间。"
            '调用机算过程
            Call r_Times
        End If
    ElseIf IsDate(Text_bTime.Text) = False And IsDate(Text_sTime.Text) = False Then
        MsgBox "您输入格式错误，格式如：" & Now
        '清空输入框
        Text_bTime.Text = ""
        Text_sTime.Text = ""
        '把光标移到开始时间的输入框
        Text_bTime.SetFocus
    ElseIf IsDate(Text_bTime.Text) = True And IsDate(Text_sTime.Text) = True Then
        '调用机算过程
        Call j_Times
    ElseIf IsDate(Text_bTime.Text) = False And IsDate(Text_sTime.Text) = True Then
        MsgBox "您输入的开始时间有误，请重新输入！"
        Text_bTime.Text = ""
        Text_bTime.SetFocus
    ElseIf IsDate(Text_bTime.Text) = True And IsDate(Text_sTime.Text) = False Then
        MsgBox "您输入的截止时间有误，请重新输入！"
        Text_sTime.Text = ""
        Text_sTime.SetFocus
    Else
        MsgBox "您的输入有误，请重新输入！"
        '清空输入框
        Text_bTime.Text = ""
        Text_sTime.Text = ""
        '把光标移到开始时间的输入框
        Text_bTime.SetFocus
    End If
End Sub

Public Sub r_Times()
    '如果没有输入截止时间时，默认此时为截止时间
    Label.Caption = "到此时相隔：" & DateDiff("yyyy",Text_bTime.Text,Now) & "年" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("q",Now) & "季节" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("m",Now) & "月" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("ww",Now) & "周" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("d",Now) & "天" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("h",Now) & "小时" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("n",Now) & "分钟" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("s",Now) & "秒"
End Sub
Public Sub j_Times()
    '机算时间
    Label.Caption = "相隔：" & DateDiff("yyyy",Text_sTime.Text) & "年" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("q",Text_sTime.Text) & "季节" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("m",Text_sTime.Text) & "月" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("ww",Text_sTime.Text) & "周" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("d",Text_sTime.Text) & "天" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("h",Text_sTime.Text) & "小时" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("n",Text_sTime.Text) & "分钟" & Chr(10)
    Label.Caption = Label.Caption & DateDiff("s",Text_sTime.Text) & "秒" & Chr(10)
End Sub

用VB写的时间计算器。