diff --git a/selfprivacy_api/backup/time.py b/selfprivacy_api/backup/time.py
new file mode 100644
index 0000000..aba12bd
--- /dev/null
+++ b/selfprivacy_api/backup/time.py
@@ -0,0 +1,28 @@
+from datetime import datetime, timedelta, time
+
+
+def same_day(a: datetime, b: datetime) -> bool:
+    return a.date() == b.date()
+
+
+def same_week(a: datetime, b: datetime) -> bool:
+    # doing the hard way because weeks traverse the edges of years
+    zerobased_weekday = a.isoweekday() - 1
+    start_of_day = datetime.combine(a.date(), time.min)
+    start_of_week = start_of_day - timedelta(days=zerobased_weekday)
+    end_of_week = start_of_week + timedelta(days=7)
+
+    if b >= start_of_week and b <= end_of_week:
+        return True
+    return False
+
+
+def same_month(a: datetime, b: datetime) -> bool:
+    return a.month == b.month and a.year == b.year
+
+
+def same_year(a: datetime, b: datetime) -> bool:
+    return a.year == b.year
+
+def same_lifetime_of_the_universe(a: datetime, b: datetime) -> bool:
+    return True