Years, Months and Days between tow dates

[Juan]

Hi everyone,

is there a function that calculates the exact amount of Years, Months, and
Days between two days?

TimeDiff is not good enough, since it calculates, for example:

Date 1: Dec. 31st 2003
Date 2: Jan 1st 2004

The real difference is 0 years, 0 months, 1 day. DateDiff returns 1 year, 1
month, 1 day.

Is there a funcion, or rutine, or does anyone know a good way to achieve the
desired result?

Thanks, from Spain

 

[Miha Markic [MVP C#]]

Hi Juan,

Try subtracting two DateTime variables and you'll end up with TimeSpan
structure.

 

[Bob Powell [MVP]]

Subtract one datetime from another to return a TimeSpan. You can get the
time accurate to the millisecond.

--
Bob Powell [MVP]
Visual C#, System.Drawing

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[Juan]

But I can´t get the numbers of years and mohts transcurred from a TimeSpan,
only the number of days, and that doesn´t solve the Dec 31st 2001 to Jan 1st
2004 problem. I will find out the number of days, but not the number of
months or years.

Bob Powell [MVP] wrote:
:: Subtract one datetime from another to return a TimeSpan. You can get
:: the time accurate to the millisecond.
::
:: --
:: Bob Powell [MVP]
:: Visual C#, System.Drawing
::
:: All you ever wanted to know about ListView custom drawing is in Well
:: Formed. http://www.bobpowell.net/currentissue.htm
::
:: Answer those GDI+ questions with the GDI+ FAQ
:: http://www.bobpowell.net/gdiplus_faq.htm
::
:: *RSS*RSS*RSS*RSS*RSS*RSS*RSS*RSS*RSS*RSS*RSS*RSS*RSS*
::
:: The GDI+ FAQ: http://www.bobpowell.net/faqfeed.xml
:: Windows Forms Tips and Tricks:
:: http://www.bobpowell.net/tipstricks.xml Bob's Blog:
:: http://royo.is-a-geek.com/siteFeeder/GetFeed.aspx?FeedId=41
::
:: *RSS*RSS*RSS*RSS*RSS*RSS*RSS*RSS*RSS*RSS*RSS*RSS*RSS*
::
::
::
::
::
:: ::: Hi everyone,
:::
::: is there a function that calculates the exact amount of Years,
::: Months, and Days between two days?
:::
::: TimeDiff is not good enough, since it calculates, for example:
:::
::: Date 1: Dec. 31st 2003
::: Date 2: Jan 1st 2004
:::
::: The real difference is 0 years, 0 months, 1 day. DateDiff returns 1
::: year, 1 month, 1 day.
:::
::: Is there a funcion, or rutine, or does anyone know a good way to
::: achieve the desired result?
:::
::: Thanks, from Spain

 

[David Browne]

Hi everyone,

is there a function that calculates the exact amount of Years, Months, and
Days between two days?

TimeDiff is not good enough, since it calculates, for example:

Date 1: Dec. 31st 2003
Date 2: Jan 1st 2004

The real difference is 0 years, 0 months, 1 day. DateDiff returns 1 year, 1
month, 1 day.

Is there a funcion, or rutine, or does anyone know a good way to achieve the
desired result?

You need to think a little more about whether your "desired result" makes
sense.

Months and Years are not fixed Timespans. Given 2 DateTime's the rule for
DateDiff is, and has to be, that the difference in years between the 2 dates
is the number of times you cross the "year boundary" (Jan 1st 12:00 am),
when traveling from the first date to the second.

Other rules are sometimes used, but they have their own difficulties.

For instance what is the difference in months between

Date 1: Jan. 31st 2003
Date 2: Feb. 28st 2003

?
The interval is 28 days long.

January has 31 days, so is the differnece is 0?
February has 28 days, so is the differnece is 1?
Or is a month defined as a 30 day timespan, so is the difference is 0?


What about
Date 1: Jan. 31st 2004
Date 2: Feb. 28st 2004
?
January has 31 days, and February has 29 days so is the difference is 0?


And what about
Date 1: Feb. 28st 2003
Date 2: Jan. 31st 2003
?
is DateDiff(d1,d2) = -DateDiff(d2,d1)?

David

 

[mikeb]

But I can´t get the numbers of years and mohts transcurred from a TimeSpan,
only the number of days, and that doesn´t solve the Dec 31st 2001 to Jan 1st
2004 problem. I will find out the number of days, but not the number of
months or years.

you can use VB.NET's DateDiff() function. Either wrap it in a class
that you can easily call from C# or call it directly by referencing the
Microsoft.VisualBasic assembly - it's in the
Microsoft.VisualBasic.DateAndTime class.