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[FIX] Clarify shifting dates RECOMMENDED, add example EDF #891

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Oct 26, 2021
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[FIX] Clarify shifting dates RECOMMENDED, add example EDF #891

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7 changes: 5 additions & 2 deletions src/02-common-principles.md
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Expand Up @@ -734,8 +734,11 @@ Describing dates and timestamps:

- Dates can be shifted by a random number of days for privacy protection
reasons.
To distinguish real dates from shifted dates, always use year 1925
or earlier when including shifted years.
To distinguish real dates from shifted dates,
is is RECOMMENDED to set shifted dates to the year 1925 or earlier.
Note that some data formats do not support arbitrary recording dates.
For example, the [EDF](https://www.edfplus.info/)
data format can only contain recording dates after 1985.
For longitudinal studies dates MUST be shifted by the same number of days
within each subject to maintain the interval information.
For example: `1867-06-15T13:45:30`
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3 changes: 3 additions & 0 deletions src/03-modality-agnostic-files.md
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Expand Up @@ -431,6 +431,9 @@ 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 the year 1925
or earlier to clearly distinguish them from unmodified data.
Note that some data formats do not support arbitrary recording dates.
For example, the [EDF](https://www.edfplus.info/)
data format can only contain recording dates after 1985.
Shifting dates is RECOMMENDED, but not required.

Additional fields can include external behavioral measures relevant to the
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