diff --git a/app/Http/Controllers/EjaculationController.php b/app/Http/Controllers/EjaculationController.php
index ef9bcd4..e062c21 100644
--- a/app/Http/Controllers/EjaculationController.php
+++ b/app/Http/Controllers/EjaculationController.php
@@ -23,6 +23,7 @@ class EjaculationController extends Controller
 
         $errors = $request->session()->get('errors');
         $initialState = [
+            'mode' => 'create',
             'fields' => [
                 'date' => old('date') ?? $request->input('date', date('Y/m/d')),
                 'time' => old('time') ?? $request->input('time', date('H:i')),
@@ -30,7 +31,8 @@ class EjaculationController extends Controller
                 'tags' => $tags,
                 'note' => old('note') ?? $request->input('note', ''),
                 'is_private' => old('is_private') ?? $request->input('is_private', 0) == 1,
-                'is_too_sensitive' => old('is_too_sensitive') ?? $request->input('is_too_sensitive', 0) == 1
+                'is_too_sensitive' => old('is_too_sensitive') ?? $request->input('is_too_sensitive', 0) == 1,
+                'is_realtime' => old('is_realtime', true)
             ],
             'errors' => isset($errors) ? $errors->getMessages() : null
         ];
@@ -43,15 +45,20 @@ class EjaculationController extends Controller
         $inputs = $request->all();
 
         $validator = Validator::make($inputs, [
-            'date' => 'required|date_format:Y/m/d',
-            'time' => 'required|date_format:H:i',
+            'date' => 'required_without:is_realtime|date_format:Y/m/d',
+            'time' => 'required_without:is_realtime|date_format:H:i',
             'note' => 'nullable|string|max:500',
             'link' => 'nullable|url|max:2000',
             'tags' => 'nullable|string',
         ])->after(function ($validator) use ($request, $inputs) {
             // 日時の重複チェック
             if (!$validator->errors()->hasAny(['date', 'time'])) {
-                $dt = $inputs['date'] . ' ' . $inputs['time'];
+                if (isset($inputs['date']) && isset($inputs['time'])) {
+                    $dt = Carbon::createFromFormat('Y/m/d H:i', $inputs['date'] . ' ' . $inputs['time']);
+                } else {
+                    $dt = now();
+                }
+                $dt = $dt->startOfMinute();
                 if (Ejaculation::where(['user_id' => Auth::id(), 'ejaculated_date' => $dt])->count()) {
                     $validator->errors()->add('datetime', '既にこの日時にチェックインしているため、登録できません。');
                 }
@@ -59,13 +66,21 @@ class EjaculationController extends Controller
         });
 
         if ($validator->fails()) {
-            return redirect()->route('checkin')->withErrors($validator)->withInput();
+            return redirect()->route('checkin')
+                ->withErrors($validator)
+                ->withInput(array_merge(['is_realtime' => false], $request->input()));
         }
 
         $ejaculation = DB::transaction(function () use ($request, $inputs) {
+            if (isset($inputs['date']) && isset($inputs['time'])) {
+                $ejaculatedDate = Carbon::createFromFormat('Y/m/d H:i', $inputs['date'] . ' ' . $inputs['time']);
+            } else {
+                $ejaculatedDate = now();
+            }
+            $ejaculatedDate = $ejaculatedDate->startOfMinute();
             $ejaculation = Ejaculation::create([
                 'user_id' => Auth::id(),
-                'ejaculated_date' => Carbon::createFromFormat('Y/m/d H:i', $inputs['date'] . ' ' . $inputs['time']),
+                'ejaculated_date' => $ejaculatedDate,
                 'note' => $inputs['note'] ?? '',
                 'link' => $inputs['link'] ?? '',
                 'source' => Ejaculation::SOURCE_WEB,
@@ -138,6 +153,7 @@ class EjaculationController extends Controller
 
         $errors = $request->session()->get('errors');
         $initialState = [
+            'mode' => 'update',
             'fields' => [
                 'date' => old('date') ?? $ejaculation->ejaculated_date->format('Y/m/d'),
                 'time' => old('time') ?? $ejaculation->ejaculated_date->format('H:i'),
diff --git a/resources/assets/js/components/CheckinForm.tsx b/resources/assets/js/components/CheckinForm.tsx
index fec11be..c03f1bd 100644
--- a/resources/assets/js/components/CheckinForm.tsx
+++ b/resources/assets/js/components/CheckinForm.tsx
@@ -1,5 +1,6 @@
-import React, { useState } from 'react';
+import React, { useState, useEffect } from 'react';
 import classNames from 'classnames';
+import { format } from 'date-fns';
 import { CheckBox } from './CheckBox';
 import { FieldError, StandaloneFieldError } from './FieldError';
 import { TagInput } from './TagInput';
@@ -10,18 +11,42 @@ type CheckinFormProps = {
 };
 
 export const CheckinForm: React.FC<CheckinFormProps> = ({ initialState }) => {
+    const mode = initialState.mode;
     const [date, setDate] = useState<string>(initialState.fields.date || '');
     const [time, setTime] = useState<string>(initialState.fields.time || '');
     const [tags, setTags] = useState<string[]>(initialState.fields.tags || []);
     const [link, setLink] = useState<string>(initialState.fields.link || '');
     const [linkForPreview, setLinkForPreview] = useState(link);
     const [note, setNote] = useState<string>(initialState.fields.note || '');
+    const [isRealtime, setRealtime] = useState<boolean>(mode === 'create' && initialState.fields.is_realtime);
     const [isPrivate, setPrivate] = useState<boolean>(!!initialState.fields.is_private);
     const [isTooSensitive, setTooSensitive] = useState<boolean>(!!initialState.fields.is_too_sensitive);
+    useEffect(() => {
+        if (mode === 'create' && isRealtime) {
+            const id = setInterval(() => {
+                const now = new Date();
+                setDate(format(now, 'yyyy/MM/dd'));
+                setTime(format(now, 'HH:mm'));
+            }, 500);
+            return () => clearInterval(id);
+        }
+    }, [mode, isRealtime]);
 
     return (
         <>
             <div className="form-row">
+                {mode === 'create' && (
+                    <div className="col-sm-12 mb-2">
+                        <CheckBox
+                            id="isRealtime"
+                            name="is_realtime"
+                            checked={isRealtime}
+                            onChange={(v) => setRealtime(v)}
+                        >
+                            現在時刻でチェックイン
+                        </CheckBox>
+                    </div>
+                )}
                 <div className="form-group col-sm-6">
                     <label htmlFor="date">
                         <span className="oi oi-calendar" /> 日付
@@ -38,6 +63,7 @@ export const CheckinForm: React.FC<CheckinFormProps> = ({ initialState }) => {
                         required
                         value={date}
                         onChange={(e) => setDate(e.target.value)}
+                        disabled={isRealtime}
                     />
                     <FieldError errors={initialState.errors?.date} />
                 </div>
@@ -57,6 +83,7 @@ export const CheckinForm: React.FC<CheckinFormProps> = ({ initialState }) => {
                         required
                         value={time}
                         onChange={(e) => setTime(e.target.value)}
+                        disabled={isRealtime}
                     />
                     <FieldError errors={initialState.errors?.time} />
                 </div>