ASP.NET中获取当日，当周，当月，当年的日期

ASP.NET中获取当日，当周，当月，当年的日期

在ASP.NET开发中，经常会碰到要获取当日，当周，当月，当年的日期。

以下将源码贴出来和大家分享。



aspx中代码如下：

<table
cellspacing="2" cellpadding="0" width="98%"
align="center">

<tr>

<td>

<asp:Label ID="lblDate" runat="server"
Text="日期"></asp:Label>:

</td>

<td>

<asp:Button ID="btnYear" runat="server" Text="当年"
CssClass="ButtonCss" OnClick="btnYear_Click"
/>

<asp:Button ID="btnMonth" runat="server" Text="当月"
CssClass="ButtonCss" OnClick="btnMonth_Click"
/>

<asp:Button ID="btnWeek" runat="server" Text="当周"
CssClass="ButtonCss" OnClick="btnWeek_Click"
/>

<asp:Button ID="btnDay" runat="server" Text="当天"
CssClass="ButtonCss" OnClick="btnDay_Click" />

</td>

</tr>

<tr>

<td>

</td>

<td>

<asp:TextBox ID="txtStartDate"
runat="server"></asp:TextBox> - 

<asp:TextBox ID="txtEndDate"
runat="server"></asp:TextBox> 

</td>

</tr>

</table>

C#.NET代码为

protected void
btnYear_Click(object sender, EventArgs e)

{

string
toyear = DateTime.Now.ToString("yyyy");

txtStartDate.Text = toyear + "-01-01";

txtEndDate.Text = toyear + "-12-31";

}

protected void
btnMonth_Click(object sender, EventArgs e)

{

DateTime
today = DateTime.Now;

string
lastday = DateTime.DaysInMonth(today.Year,
today.Month).ToString();

txtStartDate.Text = DateTime.Now.ToString("yyyy-MM") + "-01";

txtEndDate.Text = today.ToString("yyyy-MM") + "-" + lastday;

}

protected void
btnWeek_Click(object sender, EventArgs e)

{

DateTime
today = DateTime.Now;

int week =
Convert.ToInt32(today.DayOfWeek);

DateTime
sunday = today.AddDays(-week);

DateTime
saturday = today.AddDays(7 - week);

txtStartDate.Text = sunday.ToString("yyyy-MM-dd");

txtEndDate.Text = saturday.ToString("yyyy-MM-dd");

}

protected void
btnDay_Click(object sender, EventArgs e)

{

string today
= DateTime.Now.ToString("yyyy-MM-dd");

txtStartDate.Text = today;

txtEndDate.Text = today;

}

VB.NET代码为:

Protected Sub
btnYear_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Handles btnYear.Click

Dim toyear
As String = DateTime.Now.ToString("yyyy")

txtStartDate.Text = toyear + "-01-01"

txtEndDate.Text = toyear + "-12-31"

End Sub

Protected Sub
btnMonth_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Handles btnMonth.Click

Dim today As
DateTime = DateTime.Now

Dim lastday
As String = DateTime.DaysInMonth(today.Year,
today.Month).ToString()

txtStartDate.Text = DateTime.Now.ToString("yyyy-MM") + "-01"

txtEndDate.Text = today.ToString("yyyy-MM") + "-" + lastday

End Sub

Protected Sub
btnWeek_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Handles btnWeek.Click

Dim today As
DateTime = DateTime.Now

Dim week As
Int32 = Convert.ToInt32(today.DayOfWeek)

Dim sunday
As DateTime = today.AddDays(-week)

Dim saturday
As DateTime = today.AddDays(7 - week)

txtStartDate.Text = sunday.ToString("yyyy-MM-dd")

txtEndDate.Text = saturday.ToString("yyyy-MM-dd")

End Sub

Protected Sub
btnDay_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Handles btnDay.Click

Dim today As
String = DateTime.Now.ToString("yyyy-MM-dd")

txtStartDate.Text = today

txtEndDate.Text = today

End Sub