diff --git a/src/components/AbsenceClaimThanks.tsx b/src/components/AbsenceClaimThanks.tsx
new file mode 100644
index 00000000..07c3734a
--- /dev/null
+++ b/src/components/AbsenceClaimThanks.tsx
@@ -0,0 +1,82 @@
+import {
+  Button,
+  Flex,
+  Modal,
+  ModalBody,
+  ModalContent,
+  ModalFooter,
+  ModalHeader,
+  ModalOverlay,
+  Text,
+  useTheme,
+} from '@chakra-ui/react';
+import { FiCheckCircle } from 'react-icons/fi';
+
+const AbsenceClaimThanks = ({ isOpen, onClose, event, absenceDate }) => {
+  const theme = useTheme();
+
+  return (
+    <Modal isOpen={isOpen} onClose={onClose} isCentered>
+      <ModalOverlay />
+      <ModalContent
+        width="319px"
+        padding="25px"
+        sx={{
+          alignItems: 'center',
+        }}
+      >
+        <ModalHeader
+          textStyle="h3"
+          fontSize="16px"
+          padding="0"
+          textAlign="center"
+        >
+          <Flex align="center" justify="center" gap={2}>
+            <FiCheckCircle
+              size="20px"
+              color={theme.colors.positiveGreen[200]}
+            />
+            <Text>Thank you!</Text>
+          </Flex>
+        </ModalHeader>
+
+        <ModalBody
+          textStyle="subtitle"
+          color="text"
+          padding="0"
+          my="30px"
+          textAlign="center"
+        >
+          <Text as="span">You have successfully claimed </Text>
+          <Text as="span" fontWeight="bold">
+            {event?.absentTeacher?.firstName + "'s"}
+          </Text>
+          {' absence on '}
+          <Text as="span" fontWeight="bold">
+            {absenceDate + '.'}
+          </Text>
+
+          <Text my="12px">Make sure to review the lesson plan!</Text>
+
+          <Text as="span" fontWeight="bold">
+            Note:
+          </Text>
+          <Text as="span"> Please contact admin for any modifications.</Text>
+        </ModalBody>
+
+        <ModalFooter padding="0" width="full" justifyContent="center">
+          <Button
+            onClick={onClose}
+            textStyle="button"
+            fontWeight="500"
+            width="235px"
+          >
+            Got it!
+          </Button>
+        </ModalFooter>
+      </ModalContent>
+    </Modal>
+  );
+};
+
+export default AbsenceClaimThanks;
diff --git a/src/components/AbsenceDetails.tsx b/src/components/AbsenceDetails.tsx
index 8c6efecf..bf43595d 100644
--- a/src/components/AbsenceDetails.tsx
+++ b/src/components/AbsenceDetails.tsx
@@ -24,6 +24,7 @@ import { IoEyeOutline } from 'react-icons/io5';
 import AbsenceStatusTag from './AbsenceStatusTag';
 import EditAbsenceForm from './EditAbsenceForm';
 import LessonPlanView from './LessonPlanView';
+import AbsenceClaimThanks from './AbsenceClaimThanks';
 
 interface AbsenceDetailsProps {
   isOpen: boolean;
@@ -47,6 +48,9 @@ const AbsenceDetails: React.FC<AbsenceDetailsProps> = ({
   const [isDeleting, setIsDeleting] = useState(false);
   const [isDeleteDialogOpen, setIsDeleteDialogOpen] = useState(false);
   const [isEditModalOpen, setIsEditModalOpen] = useState(false);
+  const [isClaiming, setIsClaiming] = useState(false);
+  const [isClaimDialogOpen, setIsClaimDialogOpen] = useState(false);
+  const [isClaimThanksOpen, setIsClaimThanksOpen] = useState(false);
 
   const toast = useToast();
 
@@ -57,6 +61,94 @@ const AbsenceDetails: React.FC<AbsenceDetailsProps> = ({
   const isUserSubstituteTeacher = userId === event.substituteTeacher?.id;
   const isUserAdmin = userData.role === Role.ADMIN;
 
+  const getOrdinalNum = (number) => {
+    let selector;
+
+    if (number <= 0) {
+      selector = 4;
+    } else if ((number > 3 && number < 21) || number % 10 > 3) {
+      selector = 0;
+    } else {
+      selector = number % 10;
+    }
+
+    return number + ['th', 'st', 'nd', 'rd', ''][selector];
+  };
+
+  const formatDate = (date: Date) => {
+    const parsedDate = new Date(date);
+    const weekday = parsedDate.toLocaleDateString('en-CA', { weekday: 'long' });
+    const month = parsedDate.toLocaleDateString('en-CA', { month: 'long' });
+    const day = parsedDate.getDate();
+
+    return `${weekday}, ${month} ${getOrdinalNum(day)}`;
+  };
+
+  const absenceDate = formatDate(event.start!!);
+
+  const handleClaimThanksDone = () => {
+    setIsClaimThanksOpen(false);
+  };
+
+  const handleClaimAbsenceClick = () => {
+    setIsClaimDialogOpen(true);
+  };
+
+  const handleClaimCancel = () => {
+    setIsClaimDialogOpen(false);
+  };
+
+  const handleClaimConfirm = async () => {
+    setIsClaiming(true);
+
+    try {
+      const response = await fetch('/api/editAbsence', {
+        method: 'PUT',
+        headers: {
+          'Content-Type': 'application/json',
+        },
+        body: JSON.stringify({
+          id: event.absenceId,
+          lessonDate: event.start,
+          reasonOfAbsence: event.reasonOfAbsence,
+          notes: event.notes,
+          absentTeacherId: event.absentTeacher.id,
+          substituteTeacherId: userData.id,
+          locationId: event.locationId,
+          subjectId: event.subjectId,
+          roomNumber: event.roomNumber,
+        }),
+      });
+
+      if (!response.ok) {
+        throw new Error('Failed to claim absence');
+      }
+
+      toast({
+        title: 'Absence claimed',
+        description: 'You have successfully claimed this absence.',
+        status: 'success',
+        duration: 5000,
+        isClosable: true,
+      });
+
+      await fetchAbsences();
+      setIsClaimDialogOpen(false);
+      setIsClaimThanksOpen(true);
+    } catch (error) {
+      toast({
+        title: 'Error',
+        description: error.message || 'Failed to claim absence',
+        status: 'error',
+        duration: 5000,
+        isClosable: true,
+      });
+    } finally {
+      setIsClaiming(false);
+      onClose();
+    }
+  };
+
   const handleEditClick = () => {
     setIsEditModalOpen(true);
   };
@@ -180,13 +272,7 @@ const AbsenceDetails: React.FC<AbsenceDetailsProps> = ({
               <Flex gap="13px" mt="-8px">
                 <Calendar size="20px" color={theme.colors.primaryBlue[300]} />
                 <Text textStyle="subtitle" color={theme.colors.text.body}>
-                  {event.start
-                    ? new Date(event.start).toLocaleDateString('en-CA', {
-                        weekday: 'long',
-                        month: 'long',
-                        day: 'numeric',
-                      })
-                    : 'N/A'}
+                  {absenceDate}
                 </Text>
               </Flex>
               <Flex gap="13px" mt="-8px">
@@ -335,6 +421,7 @@ const AbsenceDetails: React.FC<AbsenceDetailsProps> = ({
                     height="44px"
                     fontSize="16px"
                     fontWeight="500"
+                    onClick={handleClaimAbsenceClick}
                   >
                     Fill this Absence
                   </Button>
@@ -343,6 +430,60 @@ const AbsenceDetails: React.FC<AbsenceDetailsProps> = ({
           </ModalBody>
         </ModalContent>
       </Modal>
+      <Modal isOpen={isClaimDialogOpen} onClose={handleClaimCancel} isCentered>
+        <ModalOverlay />
+        <ModalContent
+          width="300px"
+          padding="25px"
+          sx={{
+            alignItems: 'center',
+          }}
+        >
+          <ModalHeader
+            textStyle="h3"
+            fontSize="16px"
+            padding="0"
+            textAlign="center"
+          >
+            Are you sure you want to fill this absence?
+          </ModalHeader>
+          <ModalBody
+            textStyle="subtitle"
+            color="text"
+            padding="0"
+            mt="12px"
+            mb="16px"
+          >
+            <Text>{"You won't be able to undo."}</Text>
+          </ModalBody>
+          <ModalFooter padding="0">
+            <Button
+              onClick={handleClaimCancel}
+              variant="outline"
+              textStyle="button"
+              fontWeight="500"
+              mr="10px"
+            >
+              Cancel
+            </Button>
+            <Button
+              onClick={handleClaimConfirm}
+              textStyle="button"
+              fontWeight="500"
+              isLoading={isClaiming}
+              ml="10px"
+            >
+              Confirm
+            </Button>
+          </ModalFooter>
+        </ModalContent>
+      </Modal>
+      <AbsenceClaimThanks
+        isOpen={isClaimThanksOpen}
+        onClose={handleClaimThanksDone}
+        event={event}
+        absenceDate={absenceDate}
+      />
       <Modal
         isOpen={isDeleteDialogOpen}
         onClose={handleDeleteCancel}