Posted on 2007-12-06
Last Modified: 2013-12-20
In my itemchanged event of a datawindow I'm calculating the time difference between two date fields for display purposes.  
Right now it's calculating the time difference and returns the time in hours. For instance, if datetime fields say start  = 1-1-07 10:00  end = 1-1-07 10:30 then result = 0.50
I need it to return 30 minutes for display.
I was able to get this working when user enter data like a time difference of 15,30,45,and 1 hour differfence ( i was able to convert 0.25, 0.75 , 0.50 properly ). however, i get inaccurate results when user enters something like
start  = 1-1-07 02:00  end = 1-1-07 02:57 then i want to display 57minutes, but i'm getting 54 minutes because of round of issues.

please help me with this logic, i'm close but it's not working in returning for all sorts of time differences.

Question by:badtz7229
LVL 27

Expert Comment

ID: 20426655
How are you calculating the time difference in your code?

I am getting 57 mins with the following expression.

select round( ( to_date('1-1-07 02:57', 'dd-mm-yy hh24:MI') - to_date('1-1-07 02:00', 'dd-mm-yy hh24:MI')) * 24 * 60)
from dual

Author Comment

ID: 20427296
I am using the following powrbuilder code
if DaysAfter(startdate,enddate) = 0 and SecondsAfter(starttime,endtime) > 0 then
      ld_total_duration = ld_time_duration
end if

long pos_of_decimal , hours
decimal  minutes
string s_total_time
pos_of_decimal = pos ( string ( ld_time_duration)  ,'.' )
hours=  LONG  (   mid (string (  ld_time_duration )  , 1, pos_of_decimal - 1)  )
minutes =   truncate ( dec ( mid ( string (  ld_time_duration )  , pos_of_decimal , 2)   ) * 60 , 0)
s_total_time = string ( hours)  + ':' + string(minutes)
LVL 14

Expert Comment

ID: 20444056
I will suggest the option sujith80 said. That is for if you are using oracle datamase. In sybase and Microsoft SQL table name is 'dummy'. also you have to use date conversion functions accordingly.

But if you still want to go with PB code then here it is in Code Snippet. Please note that variables for days, hours, mins and seconds must be declared as Integer.

date startdate,enddate
time starttime,endtime
integer li_hours,li_mins,li_seconds,li_days
long ll_time_duration
startdate = date('1-1-07')
enddate = date('1-1-07')
starttime = time('02:00:00')
endtime = time('03:57:15')
li_days = DaysAfter(startdate,enddate)
li_hours = Integer(ll_time_duration / 3600)
li_mins = Integer(Mod(ll_time_duration,3660) / 60)
li_seconds = Mod(Mod(ll_time_duration,3600),60)

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LVL 12

Expert Comment

by:Harish Varghese
ID: 20444087
Yes, you are almost there. but it is not really that hard to achieve this. Pls change the code like this.
Date startdate, enddate
Time starttime, endtime
Decimal ld_time_duration, ld_total_duration
startdate = Date (Left(em_1.Text, 10))
enddate = Date (Left (em_2.Text,10))
starttime = Time(Mid (em_1.Text,12))
endtime= Time(Mid(em_2.Text,12))
if DaysAfter(startdate,enddate) = 0 and SecondsAfter(starttime,endtime) > 0 then
      ld_total_duration = ld_time_duration
end if
long pos_of_decimal , hours
decimal  minutes
string s_total_time
hours = Truncate (ld_time_duration / 3600, 0)
minutes = mod (ld_time_duration, 3600)  / 60
s_total_time = string ( hours)  + ':' + string(minutes)
messagebox ('s_total_time', s_total_time)
/*long pos_of_decimal , hours
decimal  minutes
string s_total_time
pos_of_decimal = pos ( string ( ld_time_duration)  ,'.' )
hours=  LONG  (   mid (string (  ld_time_duration )  , 1, pos_of_decimal - 1)  )
minutes =   truncate ( dec ( mid ( string (  ld_time_duration )  , pos_of_decimal + 1)   ) * 60 , 0) 
s_total_time = string ( hours)  + ':' + string(minutes)

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Accepted Solution

badtz7229 earned 0 total points
ID: 20455066
thanks guys, i managed to do it another way, i ended up using the piece of code that i previously posted but changed some datatypes to use DECIMAL and also used ROUND to retrieve accuarate results; instead of LONG and TRUNCATE; to get time difference of each line item.

and then i used that same logic to sum the total of all line items using a computed field.
thanks anyway.

Expert Comment

ID: 20480470
Closed, 500 points refunded.
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