# Experience of calculating time differences via DataSHIELD

**URL:** <https://datashield.discourse.group/t/experience-of-calculating-time-differences-via-datashield/203>\
**Category:** Developer support\
**Created:** [16 April 2020 15:06 UTC](https://datashield.discourse.group/t/experience-of-calculating-time-differences-via-datashield/203 "2020-04-16T15:06:59Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![daniela.zoeller](https://yyz2.discourse-cdn.com/free1/user_avatar/datashield.discourse.group/daniela.zoeller/32/16_2.png) [@daniela.zoeller](https://datashield.discourse.group/u/daniela.zoeller)\
**Post date:** [16 April 2020 15:06 UTC](https://datashield.discourse.group/t/experience-of-calculating-time-differences-via-datashield/203/1 "2020-04-16T15:06:59Z")

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Hi everyone,

is there any experience in calculating the time-to-event data, e.g., the difference in days between the date of event and the date of inclusion and using this as an endpoint?

Best wishes, Daniela

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**Author:** ![olly](https://yyz2.discourse-cdn.com/free1/user_avatar/datashield.discourse.group/olly/32/33_2.png) [@olly](https://datashield.discourse.group/u/olly)\
**Post date:** [17 April 2020 09:57 UTC](https://datashield.discourse.group/t/experience-of-calculating-time-differences-via-datashield/203/3 "2020-04-17T09:57:28Z")

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Redacted version of Paul’s post:

Hi Daniela.

I have some experience with using Datashield on data like this - data preparation and analysis. It is probably easiest to discuss quickly over the phone or Skype to explore what you need. I could briefly speak with you tomorrow [friday] morning at 11:00 [uk time] = 12:00 [CET]. If that is any good could you contact me via text to tell me [redacted by olly]. My skype name is [redacted by olly]. and if you phone me at 11:00 we can then decide whether to continue by phone or move to skype. Alternatively we can get Jayne Coyles (our research administrator) to set up a phone/Skype for next week or the week after - her email is:([Jayne.coyles2@newcastle.ac.uk](mailto:Jayne.coyles2@newcastle.ac.uk))

Cheers Paul burton

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**Author:** ![daniela.zoeller](https://yyz2.discourse-cdn.com/free1/user_avatar/datashield.discourse.group/daniela.zoeller/32/16_2.png) [@daniela.zoeller](https://datashield.discourse.group/u/daniela.zoeller)\
**Post date:** [5 May 2020 07:52 UTC](https://datashield.discourse.group/t/experience-of-calculating-time-differences-via-datashield/203/4 "2020-05-05T07:52:57Z")

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Hi Paul,

thanks for you reply and sorry for my late one - its crazy right now.

We are in a planning phase and want to decide in MIRACUM which data manipulation steps we want to do where. Basically, we now favor calculating such things before DataSHIELD (via standardized R-Files in Dockers which we already use to extract the data from the medical systems in a harmonized way across the sites) to keep the risk of enabling benchmarking the sites without permission.

Best Daniela