diff --git a/src/fime/data.py b/src/fime/data.py
index a3561d6..14b462d 100644
--- a/src/fime/data.py
+++ b/src/fime/data.py
@@ -4,7 +4,7 @@ import json
 import os
 from collections.abc import MutableMapping
 from copy import deepcopy
-from datetime import datetime, date, timedelta
+from datetime import datetime, date, timedelta, time
 from threading import Thread, Event
 from typing import List, Tuple, Dict, Union
 
@@ -200,14 +200,15 @@ class LogCommentsData:
         # trigger save
         self._data[month_str] = month
 
-    def add_log_entry(self, task: str):
-        now = datetime.now()
-        self._ensure_format(now)
-        tstr = now.strftime("%H:%M")
+    def add_log_entry(self, task: str, start_time=None):
+        if not start_time:
+            start_time = datetime.now()
+        self._ensure_format(start_time)
+        tstr = start_time.strftime("%H:%M")
         b64str = base64.b64encode(task.encode("utf-8")).decode("utf-8")
         encoded = f"{tstr} {b64str}"
-        month_str = now.strftime("%Y-%m")
-        day_str = now.strftime("%d")
+        month_str = start_time.strftime("%Y-%m")
+        day_str = start_time.strftime("%d")
         month = self._data.setdefault(month_str, {})
         month.setdefault(day_str, self._init_day)["log"].append(encoded)
         self._data[month_str] = month
@@ -269,6 +270,7 @@ class LogCommentsData:
 class Log:
     def __init__(self, data: LogCommentsData):
         self._data = data
+        self._start_date = date.today()
 
         def cleanup():
             self.log("End")
@@ -276,15 +278,22 @@ class Log:
         atexit.register(cleanup)
 
     def log(self, task):
+        if self._start_date != date.today():
+            yesterday = date.today() - timedelta(days=1)
+            yesterday_log = self.last_log(yesterday)
+            if yesterday_log:
+                self._data.add_log_entry("End", datetime.combine(yesterday, time(23, 59)))
+                self._data.add_log_entry(yesterday_log, datetime.combine(date.today(), time(0, 0)))
+            self._start_date = date.today()
         self._data.add_log_entry(task)
 
-    def last_log(self):
-        log = self._data.get_log(date.today())
+    def last_log(self, day=date.today()):
+        log = self._data.get_log(day)
         if not log:
             return None
         if log[-1][1] == "End":
             del log[-1]
-            self._data.set_log(date.today(), log)
+            self._data.set_log(day, log)
             if not log:
                 return None
         return log[-1][1]