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# Calculating Date Diff for timestamps in same field

## Calculating Date Diff for timestamps in same field

(OP)
Hi Everyone,

How do I calculate the time difference between two date/time timestamps that are in the same field, but use different codes. The fields are linked by the same event number.

For example: EMS arrived at the hospital (incilog.transcode= "H") at 02/28/2017 15:00 (incilog.timestamp (DateTime)) and cleared the hospital (incilog.transcode= "C") at 02/28/2017 15:25 (incilog.timestamp (DateTime)). EMS were on scene at the hospital for 25 minutes.

I can't figure out how to find the date difference between the two dates because they utilize the same table.field with different codes.

Any help is greatly appreciated.

Thanks,
Kim

### RE: Calculating Date Diff for timestamps in same field

If sorting by event number then by date and doing a datediff using previous or next will not work, then I would try adding the table a second time and joining the table on the event number field.
It would still require some formula logic to be written but seems quite possible.

### RE: Calculating Date Diff for timestamps in same field

Group by patient and add two formula to capture value for transcode H and C

eg
@arrival
If Trancode = H then timestamp else datetime (1900, 1, 1, 0, 0, 0)

Repeat for Clearing

in Patient footer

ad date diff formula based on max values of two formula

Eg
@Intime

datediff("n", Max(@arrival, patientgroupfield), Max(@Clear, patientgroupfield)

This should return difference in minutes

Ian

### RE: Calculating Date Diff for timestamps in same field

(OP)
Thank you Ian,

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