From 042ca11fc07783fbcbd5a7254c6f85f5c25849ee Mon Sep 17 00:00:00 2001 From: Taylor Salo Date: Sat, 23 May 2020 10:06:21 -0400 Subject: [PATCH] Clarify precision of fractional seconds. --- src/03-modality-agnostic-files.md | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/03-modality-agnostic-files.md b/src/03-modality-agnostic-files.md index 20298cbe44..69afd71ea2 100644 --- a/src/03-modality-agnostic-files.md +++ b/src/03-modality-agnostic-files.md @@ -268,8 +268,10 @@ Datetime should be expressed in the following format `2009-06-15T13:45:30[.000000]` (year, month, day, hour (24h), minute, second, and optionally fractional second; this is equivalent to the RFC3339 "date-time" format, time zone is always assumed as local time). +No specific precision is required for fractional seconds, but the precision +SHOULD be consistent across the dataset For anonymization purposes all dates within one subject should be shifted by a -randomly chosen (but common across all runs etc.) number of days. +randomly chosen (but consistent across all runs etc.) number of days. This way relative timing would be preserved, but chances of identifying a person based on the date and time of their scan would be decreased. Dates that are shifted for anonymization purposes should be set to a year 1925