diff --git a/docs/parsers/date.md b/docs/parsers/date.md
index 15b2f2fb..094932e0 100644
--- a/docs/parsers/date.md
+++ b/docs/parsers/date.md
@@ -82,7 +82,7 @@ Returns:
       "hour":         integer,
       "minute":       integer,
       "second":       integer,
-      "period":       string,
+      "period":       string,        # 'AM' or 'PM'. null if 24-hour output
       "month":        string,
       "weekday":      string,
       "weekday_num":  integer,
diff --git a/jc/parsers/date.py b/jc/parsers/date.py
index d8950822..7e536802 100644
--- a/jc/parsers/date.py
+++ b/jc/parsers/date.py
@@ -88,7 +88,7 @@ def process(proc_data):
           "hour":         integer,
           "minute":       integer,
           "second":       integer,
-          "period":       string,
+          "period":       string,        # 'AM' or 'PM'. null if 24-hour output
           "month":        string,
           "weekday":      string,
           "weekday_num":  integer,
@@ -148,7 +148,7 @@ def process(proc_data):
             'hour': dt_hour,
             'minute': dt_minute,
             'second': dt_second,
-            'period': proc_data['period'] if 'period' in proc_data else None,
+            'period': proc_data['period'].upper() if 'period' in proc_data else None,
             'month': proc_data['month'],
             'weekday': proc_data['weekday'],
             'weekday_num': weekday_map[proc_data['weekday']],