Question

我正在处理一个程序，其中SQL DB中给定日期的所有事件都填充日历。我最近从MYSQL切换到MSSQL 2012，现在我收到错误"Conversion failed when converting date and/ or time from character string."

这是形成日期的代码

   '// Set Start and End Date
    If numericMonth < 10 Then
        doubleMonth = "0" & numericMonth 'If Month was September  doubleMonth = 09 
        startDate = numericYear & "-" & doubleMonth & "-01" ' If date was June 1 2015 startdate would = 2015-06-01
        Calendar1.Refresh()
    Else
        startDate = numericYear & "-" & numericMonth & "-01"
        doubleMonth = numericMonth
    End If
    Dim endDate As String
    If numericMonth < 10 Then
        endDate = numericYear & "-0" & numericMonth & "-31"
    Else
        endDate = numericYear & "-" & numericMonth & "-31" ' If date was June 30 2015 enddate would = 2015-06-31
    End If



    If bypassMode = "0" Then




        count = 0
        dbQuery = "SELECT * FROM SOEVENTS WHERE DATE BETWEEN '" & startDate & "' AND '" & endDate & "' ORDER BY date ASC"

        If SQL.HasConnection = True Then
            SQL.RunQuery(dbQuery)
        End If

最终的结果格式为yyyy-mm-dd。所有未来的月份都会有效，但似乎过去每隔3个月都没有。

Answer 1

尽管代码的效率和安全性，但显而易见的问题是，12个月中有5个月没有第31天，在这种情况下，您尝试分配无效的日期。 VB知道如何在使用其方法时正确计算日历单位（例如月份），但从字符串中指定无效日期会产生错误。试试这个：

Dim endDate As DateTime = startDate.AddMonths(1).AddDays(-1)

在日历计划中查看过去的日期

1 个答案: