Any math wizards in here?

magnificent · 01/02/14 - 19:05

Is there a way to work out on a calculator how many days there are between:

13 June 2012 and 24 March 2013 inclusive?

artnada · 01/02/14 - 19:06

I'm sure a maths wizard will be along soon.

Maxatoria · 01/02/14 - 19:09

know your rhyme about the months and days and just work it out its not hard maths

magnificent · 01/02/14 - 19:11

Yes I know how to do it manually but need to know if there is a way to work it out on a calculator.

Mudbox · 01/02/14 - 19:13

From and including: Wednesday, 13 June 2012
To, but not including Sunday, 24 March 2013
Result: 284 days

It is 284 days from the start date to the end date, but not including the end date

Or 9 months, 11 days excluding the end date

http://www.timeanddate.com/date/durationresult.html?d1=13&m1=06&y1=2012&d2=24&m2=03&y2=2013

Maxatoria · 01/02/14 - 19:15

never seen any date functions on a normal calculator and even on my ti-83 i cant remember seeing anything like that

magnificent · 01/02/14 - 19:17

Mudbox wrote: »

http://www.timeanddate.com/date/durationresult.html?d1=13&m1=06&y1=2012&d2=24&m2=03&y2=2013

Yes I'm aware of the web based platforms that do this but I want to be able to work it out on a calculator.

[Deleted User] · 01/02/14 - 19:19

As long as you know how many days there is in each month, then it's simple to work out as it is basic arithmetic.

magnificent · 01/02/14 - 19:21

Maxatoria wrote: »

never seen any date functions on a normal calculator and even on my ti-83 i cant remember seeing anything like that

Indeed, but there may be some sort of a formula to enable a calculation on a calculator, no?

Paul_DNAP · 01/02/14 - 19:22

magnificent wrote: »

Yes I know how to do it manually but need to know if there is a way to work it out on a calculator.

No.

Your calculator won't know how many days in each moth, you will need to provide that information. You can use the calculator to subtract the dates you are looking at from total days in the month.

You can do date subtractions on Excel.

magnificent · 01/02/14 - 19:22

Vernon Bennett wrote: »

As long as you know how many days there is in each month, then it's simple to work out as it is basic arithmetic.

In theory - yes.

Mudbox · 01/02/14 - 19:23

if each month was an exact number of days(I mean, all the same), then you could maybe make a formula. As they are all a bit random, you can't really, I don't think.

Maxatoria · 01/02/14 - 19:25

heres one with date functions http://www.sharp.net.au/product-archive/products/EL387V/ but it doesn't seem like its a common feature

lemoncurd · 01/02/14 - 19:27

magnificent wrote: »

Yes I'm aware of the web based platforms that do this but I want to be able to work it out on a calculator.

The answer is no. Calculators do not have calendar information built in.

edit: Apart from that Sharp one^^

magnificent · 01/02/14 - 19:30

Maxatoria wrote: »

heres one with date functions http://www.sharp.net.au/product-archive/products/EL387V/ but it doesn't seem like its a common feature

This is useful and will consider buying it however I want to be able to calculate it on my own basic calculator.

magnificent · 01/02/14 - 19:33

lemoncurd wrote: »

The answer is no. Calculators do not have calendar information built in.

edit: Apart from that Sharp one^^

Good save!:p

Maxatoria · 01/02/14 - 19:34

With a basic calculator theres no chance...you'll need to work out the days per month and just add them up

lemoncurd · 01/02/14 - 19:37

TBH, as you are on a computer (presumably), you could just write a simple Perl/Python script to give you the answer.

magnificent · 01/02/14 - 19:49

lemoncurd wrote: »

TBH, as you are on a computer (presumably), you could just write a simple Perl/Python script to give you the answer.

No doubt but as I say - I want to be able to do it on a calculator.

There's a math calc. for everything I was once told...

Andrue · 01/02/14 - 19:54

There isn't really a formula because the number of days in a month vary but several modern computer languages have a function that will do it. Here's how you'd do it in C#:

http://www.dotnetperls.com/datetime-elapsed

There will be a VB equivalent but I won't sully my reputation by linking to it

Maxatoria · 01/02/14 - 19:55

of course theres a formula (days in first month - any days before) + (days in month 2)+(days in month 3).....+(days in month 10-any days after)

but you won't find a nice simple days =sqrt(days*30)/pi formula

PrincessEssex · 01/02/14 - 20:05

MathS plural in Uk Math singular in USofA

magnificent · 01/02/14 - 20:17

PrincessEssex wrote: »

MathS plural in Uk Math singular in USofA

...there's always one

I will deploy my stock answer which is: the abbreviation maths is preferred in the UK and the abbreviation math is preferred in the USA; both are equally correct. #etymology

bart4858 · 01/02/14 - 21:22

magnificent wrote: »

Yes I know how to do it manually but need to know if there is a way to work it out on a calculator.

You can use a calculator to work it out semi-manually; add up the days in the intervening months:

J  A  S  O  N  D  J  F
31 31 30 31 30 31 31 28

then add the days from 13th to end of June (17) and from start of March to 24th (24), giving 284 days.

If you can work out the days to the start of each month in a year, that makes things easier, but you need to prepare a lookup table:

  J   F   M   A   M   J   J   A   S   O   N   D   (J)
  0  31  59  90 120 151 181 212 243 273 304 334 (365)
  0  31  60  91 121 152 182 213 244 274 305 335 (366) (Leap year)

So for 13-June-2012, that is day # 152+13 or 165, and for 24-March-2013 it's day # 59+24 or 83. (Some diaries will give you this day number directly.) Now you're comparing years and days:

 2013  83
 2012 165

To do the calculation, however, you need to normalise the day numbers, that is, make them refer to the start of the same year. With this example, convert the 83 to the number of days from the start of 2012, by adding the number of days in 2012 (366 as it was a leap year), which makes it 83+366 or 449. The calculation is now 449-165 or 284 days.

jsmith99 · 01/02/14 - 21:26

magnificent wrote: »

Indeed, but there may be some sort of a formula to enable a calculation on a calculator, no?

We didn't do math at school, but from my maths lessons I know the difference between an expression and a formula. Calculators deal in expressions.

jsmith99 · 01/02/14 - 21:29

magnificent wrote: »

...there's always one ........

Whose opinion differs from yours? You'll be lucky if there's only one.

magnificent wrote: »

......I will deploy my stock answer which is: the abbreviation maths is preferred in the UK and the abbreviation math is preferred in the USA; both are equally correct. #etymology

One is correct in the UK, the other is correct in the US. I've no idea what the last # and word means.

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