diff --git a/src/components/frontend/DateTimePicker.jsx b/src/components/frontend/DateTimePicker.jsx
index 33b5221..f0128a9 100644
--- a/src/components/frontend/DateTimePicker.jsx
+++ b/src/components/frontend/DateTimePicker.jsx
@@ -1,4 +1,9 @@
-import { fullMonthsMapping, hourlySlots, monthsMapping, daysMapping } from "@/utils/date-time-utils";
+import {
+  fullMonthsMapping,
+  hourlySlots,
+  monthsMapping,
+  daysMapping,
+} from "@/utils/date-time-utils";
 import { formatScheduleDate, parseJsonSafely } from "@/utils/utils";
 import moment from "moment";
 import React, { useState } from "react";
@@ -7,12 +12,57 @@ import CalendarIcon from "./icons/CalendarIcon";
 import NextIcon from "./icons/NextIcon";
 import PrevIcon from "./icons/PrevIcon";
 
-const DateTimePicker = ({ defaultDate, register, fieldNames, setValue, showCalendar, setShowCalendar, toDefault, fromDefault, bookedSlots, scheduleTemplate, defaultMessage }) => {
+const DateTimePicker = ({
+  defaultDate,
+  register,
+  fieldNames,
+  setValue,
+  showCalendar,
+  setShowCalendar,
+  toDefault,
+  fromDefault,
+  bookedSlots,
+  scheduleTemplate,
+  defaultMessage,
+}) => {
   const [selectedDate, setSelectedDate] = useState(defaultDate ?? new Date());
   const [from, setFrom] = useState(fromDefault ?? "");
   const [to, setTo] = useState(toDefault ?? "");
+  const [error, setError] = useState("");
+
+  // Helper to check if a slot is booked
+  const isSlotBooked = (slotTime) => {
+    if (!bookedSlots || !Array.isArray(bookedSlots)) return false;
+    // Only check slots for the selected date
+    const selectedDateStr = moment(selectedDate).format("YYYY-MM-DD");
+    return bookedSlots.some((booking) => {
+      // booking should have start and end in ISO or parseable format
+      const bookingStart = moment(booking.start);
+      const bookingEnd = moment(booking.end);
+      // Only check if booking is on the same day
+      if (bookingStart.format("YYYY-MM-DD") !== selectedDateStr) return false;
+      // If slotTime is within booking range
+      return (
+        slotTime >= bookingStart.toDate() && slotTime < bookingEnd.toDate()
+      );
+    });
+  };
+
+  // Validate time range
+  const isTimeRangeValid = () => {
+    if (!from || !to) return false;
+    const formattedDate = moment(selectedDate).format("MM/DD/YY");
+    const fromTime = new Date(formattedDate + " " + from);
+    const toTime = new Date(formattedDate + " " + to);
+    return fromTime < toTime;
+  };
 
   const onApply = () => {
+    if (!isTimeRangeValid()) {
+      setError("Start time must be before end time.");
+      return;
+    }
+    setError("");
     setValue("from", from);
     setValue("to", to);
     setValue("selectedDate", selectedDate);
@@ -25,16 +75,14 @@ const DateTimePicker = ({ defaultDate, register, fieldNames, setValue, showCalen
       onClick={() => setShowCalendar((prev) => !prev)}
     >
       {fieldNames.map((field, idx) => (
-        <input
-          key={idx}
-          type="hidden"
-          {...register(field)}
-        />
+        <input key={idx} type='hidden' {...register(field)} />
       ))}
 
       <button
-        type="button"
-        className={`${showCalendar ? "" : "border-2"} md:border-2 p-2 w-full md:relative flex pr-16 gap-2 items-center`}
+        type='button'
+        className={`${
+          showCalendar ? "" : "border-2"
+        } flex w-full items-center gap-2 p-2 pr-16 md:relative md:border-2`}
         onClick={(e) => {
           setShowCalendar((prev) => !prev);
           e.stopPropagation();
@@ -44,31 +92,44 @@ const DateTimePicker = ({ defaultDate, register, fieldNames, setValue, showCalen
           <CalendarIcon />
         </div>
         <span
-          id="booking-time"
-          className={showCalendar ? "hidden" : "inline whitespace-nowrap md:text-base text-sm"}
+          id='booking-time'
+          className={
+            showCalendar
+              ? "hidden"
+              : "inline whitespace-nowrap text-sm md:text-base"
+          }
         >
           {from && to
-            ? monthsMapping[selectedDate.getMonth()] + " " + selectedDate.getDate() + "/" + selectedDate.getFullYear() + " - " + from + " to " + to
+            ? monthsMapping[selectedDate.getMonth()] +
+              " " +
+              selectedDate.getDate() +
+              "/" +
+              selectedDate.getFullYear() +
+              " - " +
+              from +
+              " to " +
+              to
             : defaultMessage ?? "Select date and time"}
         </span>
         {
           <div
-            className={`${showCalendar ? "block" : "hidden"
-              } absolute md:w-[unset] w-[80vw] bottom-[15px] top-[0%] md:-top-[22.5rem] 2xl:-top-[20rem] md:-left-10 lg:left-[-150px] left-0 md:right-[unset] right-0 text-center mx-auto shadow-lg bg-white border-2 text-sm md:max-h-[unset] min-h-[55vh] overflow-y-auto`}
+            className={`${
+              showCalendar ? "block" : "hidden"
+            } absolute bottom-[15px] left-0 right-0 top-[0%] mx-auto min-h-[55vh] w-[80vw] overflow-y-auto border-2 bg-white text-center text-sm shadow-lg md:-left-10 md:-top-[22.5rem] md:right-[unset] md:max-h-[unset] md:w-[unset] lg:left-[-150px] 2xl:-top-[20rem]`}
             onClick={(e) => e.stopPropagation()}
           >
-            <div className="flex justify-between items-center border-b p-[16px]">
-              <h3 className="text-xl font-semibold">Select date and time</h3>
+            <div className='flex items-center justify-between border-b p-[16px]'>
+              <h3 className='text-xl font-semibold'>Select date and time</h3>
               <button
-                type="button"
+                type='button'
                 onClick={() => setShowCalendar(false)}
-                className="p-1 border hover:bg-gray-200 active:bg-gray-300 duration-100 px-3 text-2xl font-normal rounded-full"
+                className='rounded-full border p-1 px-3 text-2xl font-normal duration-100 hover:bg-gray-200 active:bg-gray-300'
               >
                 &#x2715;
               </button>
             </div>
-            <div className="flex md:flex-row flex-col">
-              <div className="">
+            <div className='flex flex-col md:flex-row'>
+              <div className=''>
                 <Calendar
                   onChange={(newDate) => {
                     setSelectedDate(newDate);
@@ -84,33 +145,51 @@ const DateTimePicker = ({ defaultDate, register, fieldNames, setValue, showCalen
                   tileDisabled={({ date }) => {
                     let customSlots = [];
                     try {
-                      if (scheduleTemplate?.custom_slots && (Object.keys(scheduleTemplate?.custom_slots))?.length > 0) {
-                        customSlots = JSON.parse(scheduleTemplate?.custom_slots || "[]");
+                      if (
+                        scheduleTemplate?.custom_slots &&
+                        Object.keys(scheduleTemplate?.custom_slots)?.length > 0
+                      ) {
+                        customSlots = JSON.parse(
+                          scheduleTemplate?.custom_slots || "[]"
+                        );
                       }
                     } catch (e) {
                       console.error("Invalid JSON in custom_slots", e);
                     }
-                    if (customSlots.length > 0 && customSlots[(formatScheduleDate(date)).toString()]?.length === 0) {
+                    if (
+                      customSlots.length > 0 &&
+                      customSlots[formatScheduleDate(date).toString()]
+                        ?.length === 0
+                    ) {
                       return true;
                     }
-                    if (scheduleTemplate?.id && scheduleTemplate[daysMapping[date.getDay()]] != 1) {
+                    if (
+                      scheduleTemplate?.id &&
+                      scheduleTemplate[daysMapping[date.getDay()]] != 1
+                    ) {
                       return true;
                     }
                   }}
                   minDate={new Date()}
-                  maxDetail="month"
+                  maxDetail='month'
                 />
-                <p className="text-left p-[16px] text-[#667085]">Pacific Time - US & Canada</p>
-                <div className="md:flex hidden px-[16px] py-1 cursor-default text-left">
-                  <p className="min-w-[150px]">From - {from}</p>
+                <p className='p-[16px] text-left text-[#667085]'>
+                  Pacific Time - US & Canada
+                </p>
+                <div className='hidden cursor-default px-[16px] py-1 text-left md:flex'>
+                  <p className='min-w-[150px]'>From - {from}</p>
                   <p>Until - {to}</p>
                 </div>
               </div>
-              <div className="p-2">
-                <p className="font-semibold mb-4 text-center">
-                  <span className="capitalize">{daysMapping[selectedDate.getDay()]}</span> , {fullMonthsMapping[selectedDate.getMonth()]} {selectedDate.getDate()}
+              <div className='p-2'>
+                <p className='mb-4 text-center font-semibold'>
+                  <span className='capitalize'>
+                    {daysMapping[selectedDate.getDay()]}
+                  </span>{" "}
+                  , {fullMonthsMapping[selectedDate.getMonth()]}{" "}
+                  {selectedDate.getDate()}
                 </p>
-                <div className="flex flex-col gap-[12px] custom-calendar-scroll review-scroll overflow-y-auto overflow-x-hidden md:max-h-[270px] max-h-[150px] md:px-6 px-3 text-[#667085]">
+                <div className='custom-calendar-scroll review-scroll flex max-h-[150px] flex-col gap-[12px] overflow-y-auto overflow-x-hidden px-3 text-[#667085] md:max-h-[270px] md:px-6'>
                   {hourlySlots.map((tm, idx) => {
                     var formattedDate = moment(selectedDate).format("MM/DD/YY");
                     var fromTime = new Date(formattedDate + " " + from);
@@ -120,29 +199,66 @@ const DateTimePicker = ({ defaultDate, register, fieldNames, setValue, showCalen
                     var json = scheduleTemplate.custom_slots ?? "[]";
                     var custom_slots_obj = parseJsonSafely(json, {});
                     var custom_slots = custom_slots_obj[formattedDate] ?? [];
-                    custom_slots = custom_slots.map((slot) => ({ fromTime: new Date(slot.start), toTime: new Date(slot.end) }));
-                    var template_slots = Array.isArray(scheduleTemplate.slots) ? scheduleTemplate.slots.map((slot) => ({ fromTime: new Date(slot.start), toTime: new Date(slot.end) })) : [];
+                    custom_slots = custom_slots.map((slot) => ({
+                      fromTime: new Date(slot.start),
+                      toTime: new Date(slot.end),
+                    }));
+                    var template_slots = Array.isArray(scheduleTemplate.slots)
+                      ? scheduleTemplate.slots.map((slot) => ({
+                          fromTime: new Date(slot.start),
+                          toTime: new Date(slot.end),
+                        }))
+                      : [];
+
+                    // --- NEW: Check if slot is booked ---
+                    const slotBooked = isSlotBooked(slotTime);
 
                     return (
                       <button
-                        type="button"
+                        type='button'
                         key={idx}
-                        className={`${from == tm || to == tm ? "border-black border-2" : "border disabled:bg-[#F2F4F7] disabled:line-through border-[#EAECF0]"
-                          }  md:w-[152px] w-full text-center py-[8px] ${from && to && fromTime <= slotTime && toTime >= slotTime ? "font-semibold between-slots" : ""}`}
+                        className={`${
+                          from == tm || to == tm
+                            ? "border-2 border-black"
+                            : "border border-[#EAECF0] disabled:bg-[#F2F4F7] disabled:line-through"
+                        }  w-full py-[8px] text-center md:w-[152px] ${
+                          from &&
+                          to &&
+                          fromTime <= slotTime &&
+                          toTime >= slotTime
+                            ? "between-slots font-semibold"
+                            : ""
+                        }`}
                         onClick={(e) => {
                           if (from == tm) {
                             setFrom("");
                             setTo("");
+                            setError("");
                             return;
                           }
                           if (to == tm) {
                             setTo("");
+                            setError("");
                             return;
                           }
                           if (from == "") {
                             setFrom(e.target.innerText);
+                            setError("");
                           } else {
-                            setTo(e.target.innerText);
+                            // Only allow setting 'to' if after 'from'
+                            const formattedDate =
+                              moment(selectedDate).format("MM/DD/YY");
+                            const fromTime = new Date(
+                              formattedDate + " " + from
+                            );
+                            const toTime = new Date(formattedDate + " " + tm);
+                            if (toTime <= fromTime) {
+                              setError("End time must be after start time.");
+                              return;
+                            } else {
+                              setError("");
+                              setTo(e.target.innerText);
+                            }
                           }
                         }}
                         disabled={(() => {
@@ -152,11 +268,17 @@ const DateTimePicker = ({ defaultDate, register, fieldNames, setValue, showCalen
                           // disable if time is < current time
                           if (slotTime < new Date()) return true;
 
+                          // --- NEW: Disable if slot is booked ---
+                          if (slotBooked) return true;
+
                           if (custom_slots.length > 0) {
                             var shouldDisable = false;
                             for (let i = 0; i < custom_slots.length; i++) {
                               const slot = custom_slots[i];
-                              if (slot.fromTime <= slotTime && slot.toTime >= slotTime) {
+                              if (
+                                slot.fromTime <= slotTime &&
+                                slot.toTime >= slotTime
+                              ) {
                                 shouldDisable = false;
                                 break;
                               } else {
@@ -164,12 +286,14 @@ const DateTimePicker = ({ defaultDate, register, fieldNames, setValue, showCalen
                               }
                             }
                             if (shouldDisable) return true;
-                          }
-                          else {
+                          } else {
                             var shouldDisable = false;
                             for (let i = 0; i < template_slots.length; i++) {
                               const slot = template_slots[i];
-                              if (slot.fromTime <= slotTimeOnly && slot.toTime >= slotTimeOnly) {
+                              if (
+                                slot.fromTime <= slotTimeOnly &&
+                                slot.toTime >= slotTimeOnly
+                              ) {
                                 shouldDisable = false;
                                 break;
                               } else {
@@ -185,18 +309,22 @@ const DateTimePicker = ({ defaultDate, register, fieldNames, setValue, showCalen
                     );
                   })}
                 </div>
-                <div className="mt-8 px-6">
+                {/* Error message for invalid time range */}
+                {error && (
+                  <div className='mt-2 text-sm text-red-500'>{error}</div>
+                )}
+                <div className='mt-8 px-6'>
                   <button
-                    type="button"
-                    className="login-btn-gradient w-[152px] text-center py-[8px] rounded-sm text-white"
-                    disabled={from == "" || to == ""}
+                    type='button'
+                    className='login-btn-gradient w-[152px] rounded-sm py-[8px] text-center text-white'
+                    disabled={from == "" || to == "" || !isTimeRangeValid()}
                     onClick={onApply}
                   >
                     Apply
                   </button>
                 </div>
-                <div className="md:hidden flex px-1 py-1 mt-2 cursor-default text-left">
-                  <p className="min-w-[150px]">From - {from}</p>
+                <div className='mt-2 flex cursor-default px-1 py-1 text-left md:hidden'>
+                  <p className='min-w-[150px]'>From - {from}</p>
                   <p>Until - {to}</p>
                 </div>
               </div>
@@ -208,4 +336,4 @@ const DateTimePicker = ({ defaultDate, register, fieldNames, setValue, showCalen
   );
 };
 
-export default DateTimePicker;
\ No newline at end of file
+export default DateTimePicker;