如何在vb.net中编写日期代码？

VB代码

dteFrom = Format(CDate(Year(Date) & "-" & Month(Date) & "-" & "01"), "yyyy-mm-dd")
dteTo = Format(CDate(Year(Date) & "-" & Month(Date) & "-" &  DaysInMonth(dteFrom)), "yyyy-mm-dd")

我在VB.NET中复制此代码，它显示错误（日期）

谁能帮助解决这个问题呢

需要VB.Net代码。

类似于：

Dim dateString as String = string.format("{0:yyyy-MM-dd}", New DateTime(DateTime.Now.Year,DateTime.Now.Month, 1))

比如：

Dim dateString as String = string.format("{0:yyyy-MM-dd}", New DateTime(DateTime.Now.Year,DateTime.Now.Month, 1))

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看起来您需要两个字符串来表示当前月份的第一天和最后一天。在这种情况下，您可以执行以下操作：

Dim today As Date = Date.Today
Dim desiredFormat As String = "yyyy-MM-dd"

Dim fromDate As Date = New Date(today.Year, today.Month, 1)
Dim dteFrom As String = fromDate.ToString(desiredFormat)

Dim toDate As Date = fromDate.AddDays(Date.DaysInMonth(today.Year, today.Month) - 1)
Dim dteTo As String = toDate.ToString(desiredFormat)

---

看起来您需要两个字符串来表示当前月份的第一天和最后一天。在这种情况下，您可以执行以下操作：

Dim today As Date = Date.Today
Dim desiredFormat As String = "yyyy-MM-dd"

Dim fromDate As Date = New Date(today.Year, today.Month, 1)
Dim dteFrom As String = fromDate.ToString(desiredFormat)

Dim toDate As Date = fromDate.AddDays(Date.DaysInMonth(today.Year, today.Month) - 1)
Dim dteTo As String = toDate.ToString(desiredFormat)

---

这将是最接近您的原始代码：

dteFrom = Format(CDate(Year(Date.Today) & "-" & Month(Date.Today) & "-" & "01"), "yyyy-MM-dd")
dteTo = Format(CDate(Year(Date.Today) & "-" & Month(Date.Today) & "-" & Date.DaysInMonth(Year(Date.Today), Month(Date.Today))), "yyyy-MM-dd")

这将是一种更为“.NET”的方法：

dteFrom = String.Format("{0:yyyy-MM}-01", Date.Today)
dteTo = String.Format("{0:yyyy-MM}-{1:00}", Date.Today, Date.DaysInMonth(Year(Date.Today), Month(Date.Today)) )

---

这将是最接近您的原始代码：

dteFrom = Format(CDate(Year(Date.Today) & "-" & Month(Date.Today) & "-" & "01"), "yyyy-MM-dd")
dteTo = Format(CDate(Year(Date.Today) & "-" & Month(Date.Today) & "-" & Date.DaysInMonth(Year(Date.Today), Month(Date.Today))), "yyyy-MM-dd")

这将是一种更为“.NET”的方法：

dteFrom = String.Format("{0:yyyy-MM}-01", Date.Today)
dteTo = String.Format("{0:yyyy-MM}-{1:00}", Date.Today, Date.DaysInMonth(Year(Date.Today), Month(Date.Today)) )

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这些m需要资本化；小写会给你几分钟的时间。这些m需要大写；小写表示分钟。请注意，格式字符串是大写的M表示月份。小写的m是分钟。VB6函数是“智能”的，根据模式中的逻辑（看起来像日期-月份，看起来像时间-分钟）区分分钟和月份。在.NET中，您必须区分大小写，就像String.Format函数一样。请注意，格式字符串是大写的M表示月份。小写的m是分钟。VB6函数是“智能”的，根据模式中的逻辑（看起来像日期-月份，看起来像时间-分钟）区分分钟和月份。在.NET中，您必须区分大小写，就像String.Format函数一样。