One function that I regularly use on my HP 12C (next to simple arithmetic and statistics) is "Delta Days". While I really like the DM15L, missing this function (plus the option to substract or add a number of days to a given date) keeps me from using it as my work calculator.

I know there is a DM12L but a nicer option would be to have an implementation of the "Delta Days" function for the HP 15C. I am aware of some programs that compute a Gregorian date to a Julian date. However, I don't know about a program which does what the HP 12C can; pushing two dates on the stack, and returning the number of days between them.

Anyone aware of such a program, or one that could easily be adapted to the HP 15C / DM15L?

Thanks!

## DM15L - difference between two dates?

### Re: DM15L - difference between two dates?

Very nice, thank you!

### Re: DM15L - difference between two dates?

Quick update; there are many good things to the HP 12C for me, even when I hardly use any of the financial functions:

So the next questions is of course ... should I splurge on a DM12L or keep using my Singapore made HP 12C until it dies?

- Several data calculations (date plus days, difference between days, day of the week)
- Percentage functions are available as primary functions on the keys
- Statistical functions are in the same place as on the 15C
- 12x and 12/ functions are sadly missing from the 15C (difference is only one keystroke, but those keys are in my muscle memory )

So the next questions is of course ... should I splurge on a DM12L or keep using my Singapore made HP 12C until it dies?

### Re: DM15L - difference between two dates?

The DM12L is much faster than older (3-battery or 1-battery) 12Cs, so if you use programs this may be a strong factor to consider. I'm not sure of the relative performance of the DM12C as compared to the newest 2-battery machines (often called the 12C+), these are literally over 100 times faster than the older 12Cs. Also, the DM12C has the clock built-in, which may be useful too.

Also, life is short... splurge when you can!

--bob p

DM42: β00071 & 00282

DM42: β00071 & 00282