diff --git a/list.json b/list.json
index 0baab32..a2da3e5 100644
--- a/list.json
+++ b/list.json
@@ -289,6 +289,16 @@
             "supported": true,
             "des-short": "在自己拥有管理员权限的共同群组中封禁一位用户。",
             "des": "在自己拥有管理员权限的共同群组中封禁一位用户。\n指令：,sb"
+        },
+        {
+            "name": "sendat",
+            "version": "1.0",
+            "section": "chat",
+            "maintainer": "xtaodada",
+            "size": "12.2 kb",
+            "supported": true,
+            "des-short": "定时发送消息。",
+            "des": "定时发送消息。\n指令：,sendat"
         }
     ]
 }
diff --git a/sendat/main.py b/sendat/main.py
new file mode 100644
index 0000000..355c770
--- /dev/null
+++ b/sendat/main.py
@@ -0,0 +1,338 @@
+import contextlib
+import datetime
+import pytz
+
+from typing import Optional, List
+
+from pagermaid import bot
+from pagermaid.listener import listener
+from pagermaid.scheduler import scheduler
+from pagermaid.single_utils import sqlite, Message
+from pagermaid.utils import alias_command
+
+
+class SendTask:
+    task_id: Optional[int]
+    cid: int
+    msg: str
+    interval: bool
+    cron: bool
+    pause: bool
+    time_limit: int
+    hour: str = "0"
+    minute: str = "0"
+    second: str = "0"
+
+    def __init__(self, task_id: Optional[int] = None, cid: int = 0, msg: str = "", interval: bool = False,
+                 cron: bool = False, pause: bool = False, time_limit: int = -1,
+                 hour: str = "0", minute: str = "0", second: str = "0"):
+        self.task_id = task_id
+        self.cid = cid
+        self.msg = msg
+        self.interval = interval
+        self.cron = cron
+        self.pause = pause
+        self.time_limit = time_limit
+        self.hour = hour
+        self.minute = minute
+        self.second = second
+
+    def reduce_time(self):
+        if self.time_limit > 0:
+            self.time_limit -= 1
+        self.save_to_file()
+
+    def export(self):
+        return {"task_id": self.task_id, "cid": self.cid, "msg": self.msg, "interval": self.interval,
+                "cron": self.cron, "pause": self.pause, "time_limit": self.time_limit, "hour": self.hour,
+                "minute": self.minute, "second": self.second}
+
+    def get_job(self):
+        return scheduler.get_job(f"sendat|{self.cid}|{self.task_id}")
+
+    def remove_job(self):
+        if self.get_job():
+            scheduler.remove_job(f"sendat|{self.cid}|{self.task_id}")
+
+    def export_str(self, show_all: bool = False):
+        text = f"<code>{self.task_id}</code> - " \
+               f"<code>{'循环任务' if self.interval else '单次任务'}</code> - "
+        if job := self.get_job():
+            time: datetime.datetime = job.next_run_time
+            text += f"<code>{time.strftime('%Y-%m-%d %H:%M:%S')}</code> - "
+        else:
+            text += "<code>未运行</code> - "
+        if show_all:
+            text += f"<code>{self.cid}</code> - "
+        text += f"{self.msg}"
+        return text
+
+    @staticmethod
+    def check_time(time: str, min_value: int = None, max_value: int = None) -> str:
+        if max_value and int(time) > max_value:
+            raise ValueError(f"Time value {time} is too large")
+        if min_value and int(time) < min_value:
+            raise ValueError(f"Time value {time} is too small")
+        if int(time) < 0:
+            raise ValueError(f"Time value {time} is too small")
+        return time
+
+    def save_to_file(self):
+        data = sqlite.get("sendat_tasks", [])
+        for i in data:
+            if i["task_id"] == self.task_id:
+                data.remove(i)
+                break
+            data.append(self.export())
+        sqlite["sendat_tasks"] = data
+
+    @staticmethod
+    def parse_date(date: str):
+        datetime.datetime.strptime(date, "%H:%M:%S")
+
+    def parse_task(self, text: str):
+        self.msg = "|".join(text.split("|")[1:]).strip()
+        if not self.msg:
+            raise ValueError("No message provided")
+        text = text.split("|")[0].strip()
+        if "every" in text:
+            self.interval = True
+            text = text.replace("every", "").strip()
+        data = text.split(" ")
+        if len(data) % 2:
+            raise ValueError("Invalid task format")
+        format_right = False
+        no_date = True
+        for i in range(1, len(data)):
+            if data[i] == "seconds":
+                format_right = True
+                self.second = self.check_time(data[i - 1], 0, 60)
+            elif data[i] == "minutes":
+                format_right = True
+                self.minute = self.check_time(data[i - 1], 0, 60)
+            elif data[i] == "hours":
+                format_right = True
+                self.hour = self.check_time(data[i - 1], 0, 24)
+            elif data[i] == "times":
+                self.interval = True
+                self.time_limit = int(self.check_time(data[i - 1], min_value=1))
+            elif data[i] == "date":
+                format_right = True
+                no_date = False
+                self.cron = True
+                date = datetime.datetime.strptime(data[i - 1], "%H:%M:%S")
+                self.hour = str(date.hour)
+                self.minute = str(date.minute)
+                self.second = str(date.second)
+        if not format_right:
+            raise ValueError("Invalid task format")
+        if no_date:
+            self.interval = True
+            self.time_limit = 1
+
+
+class SendTasks:
+    tasks: List[SendTask]
+
+    def __init__(self):
+        self.tasks = []
+
+    def add(self, task: SendTask):
+        for i in self.tasks:
+            if i.cid == task.cid:
+                return
+        self.tasks.append(task)
+
+    def remove(self, task_id: int):
+        for task in self.tasks:
+            if task.task_id == task_id:
+                task.remove_job()
+                self.tasks.remove(task)
+                return True
+        return False
+
+    def get(self, task_id: int) -> Optional[SendTask]:
+        return next((task for task in self.tasks if task.task_id == task_id), None)
+
+    def get_all(self) -> List[SendTask]:
+        return self.tasks
+
+    def get_all_ids(self) -> List[int]:
+        return [task.task_id for task in self.tasks]
+
+    def print_all_tasks(self, show_all: bool = False, cid: int = 0) -> str:
+        return "\n".join(task.export_str(show_all) for task in self.tasks if task.cid == cid or show_all)
+
+    def save_to_file(self):
+        data = sqlite.get("sendat_tasks", [])
+        for task in self.tasks:
+            for i in data:
+                if i["task_id"] == task.task_id:
+                    data.remove(i)
+                    break
+            data.append(task.export())
+        sqlite["sendat_tasks"] = data
+
+    def load_from_file(self):
+        data = sqlite.get("sendat_tasks", [])
+        for i in data:
+            self.add(SendTask(**i))
+
+    def pause_task(self, task_id):
+        if task := self.get(task_id):
+            task.pause = True
+            task.remove_job()
+            self.save_to_file()
+            return True
+        return False
+
+    @staticmethod
+    async def send_message(task: SendTask, tasks):
+        with contextlib.suppress(Exception):
+            await bot.send_message(task.cid, task.msg)
+        task.reduce_time()
+        if task.time_limit == 0:
+            task.remove_job()
+            tasks.remove(task.task_id)
+        if not task.interval:
+            task.remove_job()
+
+    def register_interval_task(self, task: SendTask):
+        scheduler.add_job(self.send_message,
+                          "interval",
+                          id=f"sendat|{task.cid}|{task.task_id}",
+                          name=f"sendat|{task.cid}|{task.task_id}",
+                          hours=int(task.hour),
+                          minutes=int(task.minute),
+                          seconds=int(task.second),
+                          args=[task, self])
+
+    def register_cron_task(self, task: SendTask):
+        scheduler.add_job(self.send_message,
+                          "cron",
+                          id=f"sendat|{task.cid}|{task.task_id}",
+                          name=f"sendat|{task.cid}|{task.task_id}",
+                          hour=int(task.hour),
+                          minute=int(task.minute),
+                          second=int(task.second),
+                          args=[task, self])
+
+    def register_date_task(self, task: SendTask):
+        date_now = datetime.datetime.now(pytz.timezone("Asia/Shanghai"))
+        date_will = date_now.replace(hour=int(task.hour), minute=int(task.minute), second=int(task.second))
+        if date_will < date_now:
+            date_will += datetime.timedelta(days=1)
+        scheduler.add_job(self.send_message,
+                          "date",
+                          id=f"sendat|{task.cid}|{task.task_id}",
+                          name=f"sendat|{task.cid}|{task.task_id}",
+                          run_date=date_will,
+                          args=[task, self])
+
+    def register_single_task(self, task: SendTask):
+        if task.pause or task.time_limit == 0:
+            return
+        if task.interval:
+            if task.cron:
+                self.register_cron_task(task)
+            else:
+                self.register_interval_task(task)
+        else:
+            self.register_date_task(task)
+
+    def resume_task(self, task_id: int):
+        if task := self.get(task_id):
+            task.pause = False
+            self.register_single_task(task)
+            self.save_to_file()
+            return True
+        return False
+
+    def register_all_tasks(self):
+        for task in self.tasks:
+            self.register_single_task(task)
+
+    def get_next_task_id(self):
+        return max(task.task_id for task in self.tasks) + 1 if self.tasks else 1
+
+
+send_tasks = SendTasks()
+send_tasks.load_from_file()
+send_tasks.register_all_tasks()
+
+send_help_msg = f"""
+定时发送消息。
+,{alias_command("sendat")} 时间 | 消息内容
+i.e.
+,{alias_command("sendat")} 16:00:00 date | 投票截止！
+,{alias_command("sendat")} every 23:59:59 date | 又是无所事事的一天呢。
+,{alias_command("sendat")} every 1 minutes | 又过去了一分钟。
+,{alias_command("sendat")} 3 times 1 minutes | 此消息将出现三次，间隔均为一分钟。
+
+
+,{alias_command("sendat")} rm 2 - 删除某个任务
+,{alias_command("sendat")} pause 1 - 暂停某个任务
+,{alias_command("sendat")} resume 1 - 恢复某个任务
+,{alias_command("sendat")} list <all> - 获取任务列表
+"""
+
+
+async def from_msg_get_task_id(message: Message):
+    uid = -1
+    try:
+        uid = int(message.parameter[1])
+    except ValueError:
+        await message.edit("请输入正确的参数")
+        message.continue_propagation()
+    ids = send_tasks.get_all_ids()
+    if uid not in ids:
+        await message.edit("该任务不存在")
+        message.continue_propagation()
+    return uid
+
+
+@listener(command="sendat",
+          parameters="时间 | 消息内容",
+          description=f"定时发送消息\n请使用 ,{alias_command('sendat')} h 查看可用命令")
+async def send_at(message: Message):
+    if message.arguments == "h" or len(message.parameter) == 0:
+        return await message.edit(send_help_msg)
+    if len(message.parameter) == 1:
+        if message.parameter[0] != "list":
+            return await message.edit("请输入正确的参数")
+        if send_tasks.get_all_ids():
+            return await message.edit(
+                f"已注册的任务：\n\n{send_tasks.print_all_tasks(show_all=False, cid=message.chat.id)}")
+        else:
+            return await message.edit("没有已注册的任务。")
+    if len(message.parameter) == 2:
+        if message.parameter[0] == "rm":
+            if uid := await from_msg_get_task_id(message):
+                send_tasks.remove(uid)
+                send_tasks.save_to_file()
+                return await message.edit(f"已删除任务 {uid}")
+        elif message.parameter[0] == "pause":
+            if uid := await from_msg_get_task_id(message):
+                send_tasks.pause_task(uid)
+                return await message.edit(f"已暂停任务 {uid}")
+        elif message.parameter[0] == "resume":
+            if uid := await from_msg_get_task_id(message):
+                send_tasks.resume_task(uid)
+                return await message.edit(f"已恢复任务 {uid}")
+        elif message.parameter[0] == "list":
+            if send_tasks.get_all_ids():
+                return await message.edit(
+                    f"已注册的任务：\n\n{send_tasks.print_all_tasks(show_all=True)}")
+            else:
+                return await message.edit("没有已注册的任务。")
+    # add task
+    task = SendTask(send_tasks.get_next_task_id())
+    task.cid = message.chat.id
+    try:
+        task.parse_task(message.arguments)
+    except Exception as e:
+        return await message.edit(f"参数错误：{e}")
+    send_tasks.add(task)
+    send_tasks.register_single_task(task)
+    send_tasks.save_to_file()
+    await message.edit(f"已添加任务 {task.task_id}")