2 files changed, 21 insertions, 0 deletions
diff --git a/app/src/main/java/com/camilstaps/common/Date.java b/app/src/main/java/com/camilstaps/common/Date.java
index c01cc0d..8e5d6f4 100644
--- a/app/src/main/java/com/camilstaps/common/Date.java
+++ b/app/src/main/java/com/camilstaps/common/Date.java
@@ -110,6 +110,14 @@ public class Date implements Comparable<Date> {
         }
     }
 
+    public void addOrSubtractDays(int n) {
+        if (n < 0) {
+            subtractDays(-n);
+        } else {
+            addDays(n);
+        }
+    }
+
     public boolean equals(Date date) {
         return year == date.year && month == date.month && day == date.day;
     }
diff --git a/app/src/main/java/com/camilstaps/common/DatedStringPreferenceSet.java b/app/src/main/java/com/camilstaps/common/DatedStringPreferenceSet.java
index d61ba37..d17bc90 100644
--- a/app/src/main/java/com/camilstaps/common/DatedStringPreferenceSet.java
+++ b/app/src/main/java/com/camilstaps/common/DatedStringPreferenceSet.java
@@ -87,4 +87,17 @@ public class DatedStringPreferenceSet {
         put(context, key, new HashSet<DatedString>());
     }
 
+    public static void remove(Context context, String key, Date date) {
+        Set<DatedString> set = (Set) get(context, key, DatedString.class);
+        Iterator<DatedString> iterator = set.iterator();
+        boolean add = false;
+        while (iterator.hasNext()) {
+            DatedString this_object = iterator.next();
+            if (this_object.getDate().equals(date)) {
+                iterator.remove();
+            }
+        }
+        put(context, key, set);
+    }
+
 }