#### cdeane

##### Member
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

##### Well-Known Member
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
B4X:
``TimeFormat("HH:mm")``
you could do something like this
B4X:
``Label1.Text = Time(TimeParse("03:45") - TimeParse("03:25"))``
wich results in Label1.Text = "00:20"

specci48

#### agraham

##### Expert
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

##### Member
Ill give them a try.
Thank you very much

Staff member

#### kavka

##### Member
Hello!

A question about ticks, time dates...

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

Thx, kavka

#### Erel

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

#### kavka

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

Thx

#### Erel

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

#### kavka

##### Member
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

##### Active Member
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,
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