On Tue, 17 Apr 2012 10:44:40 -0400, Denis Chabot wrote: 

>> Hi,
>>

>> I cannot make a reproducible example easily for my problem, so
I'll
>> describe it as best as I can.

YOU KIND OF NEED ONE...

>>>
a=test1$période[21]
>> 
>>> b=test2$date[22]
>> a x
>> in-left: 5px;
width: 100%;">b 
>> 
>> [1] "2011-04-06"
>> 
>>> 

THIS IS WHY YOU NEED
TO GIVE US A REPRODUCABLE MEANS BECAUSE IF I SIMPLY DO A="2011-04-06"
AND B="2011-04-06" I'M GOING TO GET A==B TRUE

WHERE IS THE DATA IN THE
DF'S BEING SOURCED FROM? IS IT A DATABASE? COULD THERE BE DIFFERENT DATA
DEFINITIONS? IS ITS A CSV FILE ETC? 
  as.integer(a) 
> 
> [1] 15070
>

>> as.integer(b)
> 
> [1] 15070
> 
> SUGGESTION THAT MIGHT POINT YOU IN
A DIRECTION...
> 
> as.integer (15070)
> 
> [1] 15070
> 
> as.integer
(15070.1)
> 
> [1] 15070
> 
> as.
0)==as.integer(15070.1) 

[1]
TRUE

15070==15070.1

[1] FALSE

SECOND SUGGESTION WOULD BE TO DROP THE
É NO IDEA WHY THAT WOULD CAUSE A PROBLEM (OR WHERE), BUT ANYTHING THATS
NOT A-Z OR A-Z ONLY INTRODUCES A POTENTIAL EXTRA HEADACHE..

  
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