From 9d5681f6fb93abf0dee719927b1d4dd35eaf7739 Mon Sep 17 00:00:00 2001
From: Jennifer Altreuter <jennifer@dsjennifermacport.dfci.harvard.edu>
Date: Tue, 4 Jun 2024 10:00:32 -0400
Subject: [PATCH] Adding index date section.

---
 .DS_Store                             | Bin 10244 -> 10244 bytes
 data_submission/clin_biospec_assay.md |   2 +-
 data_submission/dates.md              |   9 +++++++++
 3 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 data_submission/dates.md

diff --git a/.DS_Store b/.DS_Store
index dd234e1fc6af56d2c7747aa3f746faed6cb13ce9..1be40d6c3177cc50dec982fe41eb7d639fd0b3ea 100644
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diff --git a/data_submission/clin_biospec_assay.md b/data_submission/clin_biospec_assay.md
index a2b16153..a0cfff34 100644
--- a/data_submission/clin_biospec_assay.md
+++ b/data_submission/clin_biospec_assay.md
@@ -1,5 +1,5 @@
 ---
-order: 995
+order: 994
 ---
 
 # Submitting Assay Data and Metadata
diff --git a/data_submission/dates.md b/data_submission/dates.md
new file mode 100644
index 00000000..5c3c2277
--- /dev/null
+++ b/data_submission/dates.md
@@ -0,0 +1,9 @@
+---
+order: 995
+---
+
+# What is the index date?
+
+HTAN cannot accept dates because they are considered Protect Health Information (PHI). In order to obfuscate dates, they should be converted
+to days from an index date.  In this case, the index date is the participant's date of birth.  For example, a participant's therapy start date 
+would be recorded as 365 days if the therapy took place 365 days after a participant's date of birth.
\ No newline at end of file