Add & Subtract Time

[cdeane]

I need to know how to add/subtract time.
I'm creating a numpad that will display the time in increments(1:00,5:00,10:00 so on and so forth).
The user only needs to see the time he/she inputs.I can do that.But what I cant do is to so the sum.
I suppose I could convert time in to ticks but that is lost on me.

Here I have an example of what I'm working on:

(03:25-03:45=00:20)
then
(09:00+21:00=11:40)

As you see I'm using 24 hour display and I subtracted the 20min from the run time of 12 hours.

 

[specci48]

I think I really didn't get your problem.
You could easily use Time and TimeParse for your calculations.

After setting the preferred time format (24 hour display) with

TimeFormat("HH:mm")

you could do something like this

Label1.Text = Time(TimeParse("03:45") - TimeParse("03:25"))

wich results in Label1.Text = "00:20"


specci48

 

[agraham]

I suppose I could convert time in to ticks but that is lost on me

This is best (and easiest) thing to do to perform accurate time calculations - it's not difficult to get your head round it. Ticks are just a count of small increments of time from a defined starting time. Convert to ticks, do the sums and convert back at the end. Just read through Help->Main Help->Keywords->Time to see what can be done.

 

[cdeane]

Ill give them a try.
Thank you very much

 

[Erel]

See the Date and Time tutorial: http://www.b4x.com/forum/showthread.php?t=894

 

[kavka]

Hello!

A question about ticks, time dates...

What about the years with february with 29 days? Is this included in ticks.

Thx, kavka

 

[Erel]

Ticks represent 1 / 10,000,000 of a second.
When you use Date (TicksValue), leap years and regular years are considered.

 

[kavka]

So you think that calculation of dates and times is better to be performed with ticks than with TimeParse?

Thx

 

[Erel]

It is easier to convert the time string to ticks with TimeParse / DateParse and then do the calculations with the ticks values.

 

[kavka]

Hello!

I want to add time values togeder which are in a table (all in one column). The sum will be higher then 24 hours and I need the value in hour:minute form (345:23). How is this possible to do?

These time values are sorted by dates, I want to add togeder these time values for previous six days. Not the last six entries but the last six days.

Thx

 

[Rioven]

Hi kavka,

Convert first the date/time to 'ticks' before adding/subtracting them.

and then convert it back to hours and minutes like...

SUM=summation of ticks

h=Int(sum/cticksperhour)
m=Int((sum Mod cticksperhour)/cticksperminute)
Msgbox(h&":"&m)

Regards,
__________________

 

[kavka]

Ok Rioven, I will try it this way.

Thx