[英]how to get exact 3 months ago date and time from today's date and current time using C#
我想从过去3个月保存的数据库获取数据,因为我有当前的日期和时间,但是如何计算3个月的自我日期和时间,这样我可以在查询中传递这2个日期并获取数据在这些日期之间保存
使用AddMonths
方法 :
DateTime ago = DateTime.Now.AddMonths(-3);
尝试这个:
DateTime.Now.AddMonths(-3)
你可以尝试这个DateTime.Now.AddMonths(-3)
AddMonths
可能是负面的。
DataTable tblResult = new DataTable();
string sql = "SELECT * FROM dbo.TableName WHERE Date BETWEEN @startDate AND @endData";
using (var con = new SqlConnection(connectionString))
using (var cmd = new SqlCommand(sql, con))
using (var da = new SqlDataAdapter(cmd))
{
// asuming that your startdate is three months ago and your enddate is now
cmd.Parameters.AddWithValue("@startDate", DateTime.Now.AddMonths(-3));
cmd.Parameters.AddWithValue("@endDate", DateTime.Now);
da.Fill(tblResult);
}
DateTime now = DateTime.Now;
DateTime olddate = new DateTime(now.Year,now.Month - 3,now.Day);
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