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Exclude overnight hours in DateDiff calculation

MikhaylaB

I've written an Arcade attribute rule to calculate hours spent working on a project. I need to update that script to exclude the hours between 4:01PM and 6:59AM. My code is as follows:

var StartDate = $feature.TimeStart
var EndDate = $feature.TimeEnd
var TimeDiff = DateDiff(EndDate, StartDate, 'hours')
return TimeDiff

Link to previous post:

https://community.esri.com/t5/arcgis-pro-questions/update-integer-field-with-datediff/td-p/1388053#M79457

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Accepted answers

MikhaylaB

I ultimately didn't need to exclude the overnight hours because I learned the work stops by end of business hours and a new entry is created for the next day. I did have an issue with my field not allowing decimals as a result from my equation, so I changed from a short integer to a double. I wanted hour and fraction of an hour as a whole number + decimal. Final code below:

var StartDate = $feature.TimeStart
var EndDate = $feature.TimeEnd
var TimeDiff = DateDiff(EndDate, StartDate, 'hours')
var Minutes = DateDiff(EndDate, StartDate, 'minutes')
var MinDiff = (Minutes-60)/60
var HourMin= Number(TimeDiff + MinDiff)
return TimeDiff

kenbuja

This should work. It calculates the number of days between the start date and end date and subtracts 15 hours for each day.

var StartDate = $feature.TimeStart
var EndDate = $feature.TimeEnd
var TimeDiff = DateDiff(EndDate, StartDate, 'hours')
var DayDiff = DateDiff(DateOnly(EndDate), DateOnly((StartDate)), 'days')
var HoursOff = 15 * DayDiff

return TimeDiff - HoursOff

All comments

MikhaylaB

Hi, I have a question unrelated to this post, but you were very helpful with my last Arcade question. I have two attribute rules that I need to combine, because they are firing in the wrong order as separate rules. I need to first calculate the GPM from a value entered into the Flow field (both are fields in the same related table). I need that GPM value to update a parent feature class in the "class" field. Do you have an idea how I could combine these two expressions?

//Calculate GPM

var flow = $feature["Flow"];
var gpm = 0;

if (!isEmpty(flow)) {
gpm = (29.7 * (2.5 * 2.5) * Sqrt(flow) * 0.9)
}
return gpm;

//Update Parent Class

var parent_id = $feature.hydrantObjid ;

var parent_class = FeatureSetByName($datastore, "hydrantCopy", ["OBJECTID", 'class'], false);
var parent_records = Filter(parent_class, "OBJECTID = @parent_id");

var updates = [];
var i = 0;
var new_value = 'no gpm';

if ($feature.GPM >= 1500) {
new_value = "Blue - 1500 GPM or Greater";
}
else if ($feature.GPM >= 1000) {
new_value = "Green - 1000-1499 GPM";
}
else if ($feature.GPM >= 500){
new_value = "Orange - 500-999 GPM";
}
else {
new_value = "Red - 0-499 GPM";
}

for (var row in parent_records) {
// If the parent row is null or has a different value, updated it
if (IsEmpty(row['class']) || row['class'] != new_value)
{
updates[i++] = {
'OBJECTID': parent_id,
'attributes': {"class": new_value}
};
}
}

return {
'result': parent_id,
'edit': [
{'className': 'hydrantCopy',
'updates': updates
}
]
};

MikhaylaB

kenbuja

If you want the hours just rounded to something like 2.5, use Round function (and template literals)

return `${Round(TimeDiff - HoursOff, 1)} hours`

You can add this to return the hours and minutes

var TotalTime = TimeDiff - HoursOff
var Hours = Floor(TotalTime);
var Minutes = Floor((TotalTime - Hours) * 60)
return `${Hours} hours and ${Minutes} minutes`

MikhaylaB

Thanks, that should be good. Might you know how to include hours and minutes, like 2.5 hours? I noticed it rounds down to the closest hour.

kenbuja

This should work. It calculates the number of days between the start date and end date and subtracts 15 hours for each day.

var StartDate = $feature.TimeStart
var EndDate = $feature.TimeEnd
var TimeDiff = DateDiff(EndDate, StartDate, 'hours')
var DayDiff = DateDiff(DateOnly(EndDate), DateOnly((StartDate)), 'days')
var HoursOff = 15 * DayDiff

return TimeDiff - HoursOff

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