DateTime Compare how to check if a date is less than 30 days old

Question

I m trying to work out if an account expires in less than 30 days  Am I using DateTime Compare correctly   if  DateTime Compare expiryDate  now   lt  30          matchFound   true

User · Answer

No  the Compare function will return either 1  0  or -1  0 when the two values are equal  -1 and 1 mean less than and greater than  I believe in that order  but I often mix them up

User · Answer

Assuming you want to assign false  if applicable  to matchtime  a simpler way of writing it would be    matchtime     expiryDate - DateTime Now  TotalDays  lt  30

User · Answer

Compare is unnecessary  Days   TotalDays are unnecessary   All you need is  if  expireDate  lt  DateTime Now           has expired   else          not expired     note this will work if you decide to use minutes or months or even years as your expiry criteria

User · Answer

No it s not correct  try this     DateTime expiryDate   DateTime Now AddDays -31   if  DateTime Compare expiryDate  DateTime Now AddDays -30    lt  1        matchFound   true

User · Answer

this isn t set up for good processing      I don t know what data set has the expiration    dates of your accounts   I assume a list     matchfound is a single variablethat returns true if any 1 record is expired   bool matchFound   false              DateTime dateOfExpiration   DateTime Today AddDays -30               List lt DateTime gt  accountExpireDates   new List lt DateTime gt                 foreach  DateTime date in accountExpireDates                                if  DateTime Compare dateOfExpiration  date     -1                                        matchFound   true

User · Answer

No you are not using it correctly   See here for details   DateTime t1   new DateTime 100   DateTime t2   new DateTime 20    if  DateTime Compare t1  t2   gt   0  Console WriteLine  t1  gt  t2     if  DateTime Compare t1  t2     0  Console WriteLine  t1    t2     if  DateTime Compare t1  t2   lt   0  Console WriteLine  t1  lt  t2

User · Answer

Try this instead  if    expiryDate - DateTime Now   TotalDays  lt  30        matchFound   true

User · Answer

What you want to do is subtract the two DateTimes  expiryDate and DateTime Now    This will return an object of type TimeSpan   The TimeSpan has a property  Days    Compare that number to 30 for your answer

User · Answer

Compare returns 1  0  -1 for greater than  equal to  less than  respectively    You want               if  DateTime Compare expiryDate  DateTime Now AddDays 30    lt   0                  bool matchFound   true

User · Answer

You can try to do like this   var daysPassed    DateTime UtcNow - expiryDate  Days  if  daysPassed  gt  30

User · Answer

should be   matchFound    expiryDate - DateTime Now  TotalDays  lt  30    note the total days otherwise you ll get werid behaviour

User · Answer

Well I would do it like this instead   TimeSpan diff   expiryDate - DateTime Today  if  diff Days  gt  30      matchFound   true    Compare only responds with an integer indicating weather the first is earlier  same or later

User · Answer

Am I using DateTime Compare correctly    No  Compare only offers information about the relative position of two dates  less  equal or greater  What you want is something like this   if   expiryDate - DateTime Now  TotalDays  lt  30      matchFound   true    This subtracts two DateTimes  The result is a TimeSpan object which has a TotalDays property   Additionally  the conditional can be written directly as   matchFound    expiryDate - DateTime Now  TotalDays  lt  30    No if needed

User · Answer

Actually none of these answers worked for me  I solved it by doing like this     if   expireDate Date - DateTime Now  Days  gt  -30          matchFound   true        When i tried doing this   matchFound    expiryDate - DateTime Now  Days  lt  30    Today  2011-11-14 and my expiryDate was 2011-10-17 i got that matchFound   -28  Instead of 28  So i inversed the last check

User · Answer

This will give you accurate result    if   expiryDate Date - DateTime Now Date  Days  lt  30      matchFound   true

[c#] DateTime.Compare how to check if a date is less than 30 days old?

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