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Subtracting dates function

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jmazurow

(@jmazurow)

Posts: 86

Estimable Member

Topic starter

Does anyone have a function they would share, that takes two times, subtracts them and returns the total time between the two ? I am trying to do this, but having problems. Part of my function is shown here:

position = match(str(start),1,":")

if str(position) = 2 then hour = sub(start,1,1) and mins1 = sub(start,3,2) else "" endif

if str(position) = 3 then hour = sub(start,1,2) and mins1 = sub(start,4,2) else "" endif

return hour

If the time is 11:30 AM, and I return position, it shows 3, or the place of the colon. However, if I return hour, getting zero, not 11. Any help would be appreciated.

John / Faxton St. Lukes Healthcare

Posted : January 13, 2014 1:19 am

jjordet

(@jjordet)

Posts: 545

Honorable Member

DURATIONDAYS
description

The difference of days between two dates. The number returned can be negative.

type

Data symbol function

syntax

DURATIONDAYS(date1,date2)

arguments

date1 The first date as a string in mm/dd/yyyy format
date2 The second date as a string in mm/dd/yyyy format

when to evaluate

When Inserted in Note or Continuously

returns

A string containing the number of days between two dates

comment

The value returned is the difference of days and the returned number can be negative

examples

First date earlier:

{DURATIONDAYS("11/25/2002","03/06/2003")}

returns 101

Second date earlier:

{DURATIONDAYS ("03/06/2003","11/25/2002")}

returns -101

Dates equal:

{DURATIONDAYS ("11/25/2002","11/25/2002")}

returns 0

A more complicated example that defines a function for calculating how many weeks a woman is pregnant based on last menstrual period:

{fn WEEKS_PREG(lmp)

{

LOCAL days

LOCAL preg

if lmp = "" then

return ""

else

days = DURATIONDAYS(lmp,str(._TODAYSDATE))

preg = div(val(days), 7) + " weeks"

if mod(val(days), 7) <> 0 then

preg = preg + " and " + mod(val(days), 7)

if mod(val(days), 7) = 1 then

preg = preg + " day"

else

preg = preg + " days"

endif

endif

endif

return preg

}

where used

Chart: letter and handout templates, text components, chart notes, and quick text

Encounter Form Editor: MEL expressions

Posted : January 13, 2014 10:12 pm

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