Subtract days from a DateTime

Question

I have the following code in my C  program   DateTime dateForButton    DateTime Now    dateForButton   dateForButton AddDays -1       ERROR  un-representable DateTime   Whenever I run it  I get the following error      The added or subtracted value results in an un-representable DateTime    Parameter name  value   Iv e never seen this error message before  and don t understand why I m seeing it   From the answers Iv e read so far  I m lead to believe that I can use -1 in an add operation to subtract days  but as my question shows this is not the case for what I m attempting to do

User · Answer

You can do    DateTime Today AddDays -1

User · Answer

I ve had issues using AddDays -1    My solution is TimeSpan   DateTime Now - TimeSpan FromDays 1

User · Answer

The object  i e  destination variable  for the AddDays method can t be the same as the source    Instead of   DateTime today   DateTime Today  today AddDays -7     Try this instead   DateTime today   DateTime Today  DateTime sevenDaysEarlier   today AddDays -7

User · Answer

You can use the following code   dateForButton   dateForButton Subtract TimeSpan FromDays 1

User · Answer

Using AddDays -1  worked for me until I tried to cross months  When I tried to subtract 2 days from 2017-01-01 the result was 2016-00-30  It could not handle the month change correctly  though the year seemed to be fine     I used date   Convert ToDateTime date  Subtract TimeSpan FromDays 2   ToString  yyyy-mm-dd    and have no issues

User · Answer

The dateTime AddDays -1    does not subtract that one day from the dateTime reference  It will return a new instance  with that one day subtracted from the original reference                DateTime dateTime   DateTime Now  DateTime otherDateTime   dateTime AddDays -1

User · Answer

That error usually occurs when you try to subtract an interval from DateTime MinValue or you want to add something to DateTime MaxValue  or you try to instantiate a date outside this min-max interval   Are you sure you re not assigning MinValue somewhere

User · Answer

DateTime dateForButton   DateTime Now AddDays -1

User · Answer

Instead of directly decreasing number of days from the date object directly  first get date value then subtract days  See below example   DateTime SevenDaysFromEndDate   someDate Value AddDays -1     Here  someDate is a variable of type DateTime

[c#] Subtract days from a DateTime

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