comparing dates

comparing dates

[urgrue]

anyone know an easy way to compare dates and display the difference? 
difference doesnt have to be in date format, in fact it would be even 
easier if it was just one unit, like "total diff in seconds" or 
nanoseconds or whatever, doesnt matter.

Re: comparing dates

[Stefan Wimmer]

* urgrue <urgrue@tumsan.fi> wrote on 10/Oct/2003 - 11:54:08 :
> anyone know an easy way to compare dates and display the difference? 
> difference doesnt have to be in date format, in fact it would be even 
> easier if it was just one unit, like "total diff in seconds" or 
> nanoseconds or whatever, doesnt matter.

If you are comfortable with Perl you could use Date::Calc

  http://search.cpan.org/~stbey/Date-Calc-5.3/Calc.pod

It does a great job with everything involving dates ...

Greetz
Stefan 

Re: comparing dates

[Chuck Campbell]

On Fri, Oct 10, 2003 at 12:25:21PM +0200, Stefan Wimmer wrote:
> * urgrue <urgrue@tumsan.fi> wrote on 10/Oct/2003 - 11:54:08 :
> > anyone know an easy way to compare dates and display the difference? 
> > difference doesnt have to be in date format, in fact it would be even 
> > easier if it was just one unit, like "total diff in seconds" or 
> > nanoseconds or whatever, doesnt matter.


Sys admin published an article on date handling via shell, perl (and some
other option) recently.  All the code they discussed is available on their
site.  You would have to search for it, as I don't have the url handy.

Google for SysAdmin

-chuck


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Re: comparing dates

[Max Lapan]

urgrue <urgrue@tumsan.fi> writes:

> anyone know an easy way to compare dates and display the difference?
> difference doesnt have to be in date format, in fact it would be even
> easier if it was just one unit, like "total diff in seconds" or
> nanoseconds or whatever, doesnt matter.

see options -d and %s in date's man page

-- 
Never trust anybody whose arm is bigger than your leg.

Re: comparing dates

[gerardo juarez-mondragon]

I found this in an old programmable calculator
library manual:

'The number of days between dates is found by
calculating the FACTOR for each date, then
finding the difference between the FACTORS.

For January and February:

FACTOR = 365 * y + d + 31 * (m - 1) +
         int((y - 1) / 4) -
         int(3 / 4 * int((y - 1) / 100 + 1))

For March through December:

FACTOR = 365 * y + d + 31 * (m - 1) -
         int(0.4 * m + 2.3) + int(y / 4) -
         int(3 / 4 * (int(y / 100) + 1) 

The day of the week is determined from the 
FACTOR for that date as follows:

dayofweek = FACTOR + int(-factor / 7) * 7

where the day is represented by a single digit 0
through 6 for Saturday through Friday'
(that is sat=0, sun=1, etc.)

I thought you might like to just have an equation
to cut and paste into your code :-)

Cheers,
Gerardo


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