我想从DateTime变量中减去小时数和分钟数,并且发现其他文章显示您应该能够使用.AddHours(-3)来实现此目的但它不适合我。我从vb.net中的DateTimePicker控件获取日期时间。比如说时间是上午10点,我想从中减去3小时,使它成为上午7点。我的小时变量的计算结果为-3,但即使我将字符数-3置于.AddHours中,它仍然不会减去时间。继承人的代码从DateTime不工作中减去小时数和分钟数
Dim ApptTime As DateTime = Convert.ToDateTime(DateTimePicker2.Value)
Dim travelTime As String = Label60.Text
Dim newtime As Double
Dim split() As String = travelTime.Split(" ")
If split.Length = 2 Then
Dim Minutes As String = split(0).Replace("mins", "")
Else
Dim Hours As Double = split(0).Replace("Hours", "")
Dim Minutes As Double = split(2).Replace("mins", "")
Hours = -Hours
Minutes = -Minutes
ApptTime.AddHours(Hours)
ApptTime.AddMinutes(Minutes)
Label62.Text = (ApptTime.ToString)
他们返回新值的函数:'AppTime = ApptTime.AddHours(小时)' – Plutonix 2015-03-31 14:15:35
某事如此简单...... Ha感谢您的帮助,这样做的技巧 – user3841709 2015-03-31 14:17:35
它总是有助于阅读[文档](https://msdn.microsoft.com/en-us/library/system.datetime.addhours% 28v = vs.110%29.aspx):“此方法不会更改此'DateTime'的值。相反,它返回一个新的'DateTime',其值是该操作的结果...“ – 2015-03-31 14:17:38