# How to calculate time with another time

Dear user,

Am doing a time calculation in navision, where am calculating a time + time, Is it possible to calculate or need exact c/Al code  for time calculation.

• In this case one of the operand should be Time whereas other as integer (in MilliSeconds)..

For more details have a look on Codeunit 416 DateTime Mgmt.

For example, following code will increment the initial time defined by 1 minute (60*1000  mili seconds):

TimeCalc:=010145T;
TimeCalc:=TimeCalc+60000;
MESSAGE('%1',TimeCalc);

• What always helps me is to realize that the Time data type is representing a time instance, like 1 o'clock. So wanting to add two time instances (two Time variables) doesn't make sense. BEcause what would the outcome of:

1:00 AM + 5:00 PM = ?

To calculate a new time instance based on a current time instance you need to add a time duration being the "integer (in MilliSeconds" Dhan Rai refers to. So the calculation is:

New Time Instance = Old Time Instance + Time Duration

or in NAV data types:

Time := Time + Integer

Hopes this makes sense.

• In reply to Luc van Vugt:

Luc van Vugt
So wanting to add two time instances (two Time variables) doesn't make sense

Oh yes, it does. I have made some rathar large and timeconsuming batches, at I found it handy to know, when the batch is expected to end - an estimation. And at that time you may calc StartTime + EstimatedTimeLft = ExpectedEndTime.

Else - to calculate two times results in an integer. If you want the result in a time-datatype the formula is "ResultTime := 00T + (ActualTime - StartTime)" (00T allows type conversion from integer to time).

But that is still not adding two time instance.

StartTime + EstimatedTimeLft = ExpectedEndTime

This equation is of type:

New Time Instance = Old Time Instance + Time Duration

• In reply to Luc van Vugt:

How do you calculate the difference between 2 time instances ? I need to get a duration, based on a starting and ending time ie

Duration = End time - Start time.

This however does not compile.

What is you exact code?

Avril
Duration = End time - Start time

But the fact that it does not compile is probably due to soem error in the syntax of you code. So what's your code and also give the definitations of the variables included.

• In reply to Luc van Vugt:

Hello everybody

I've to calculate a total time of a work adding two duration:

Total Time := (FinalTime1 - InitTime1) + (FinalTime2 - InitTime2). Is it possible?

What kind of types must be the variables?Is Total Time a integer in milliseconds?

Thank You so much