refactored expense date to be a Temporal.PlainDate

package-lock.json

@@ -9,6 +9,7 @@
       "version": "0.0.1",
       "license": "UNLICENSED",
       "dependencies": {
+        "@js-temporal/polyfill": "^0.5.1",
         "@nestjs/common": "^11.0.1",
         "@nestjs/config": "^4.0.3",
         "@nestjs/core": "^11.0.1",
@@ -2063,6 +2064,18 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@js-temporal/polyfill": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/@js-temporal/polyfill/-/polyfill-0.5.1.tgz",
+      "integrity": "sha512-hloP58zRVCRSpgDxmqCWJNlizAlUgJFqG2ypq79DCvyv9tHjRYMDOcPFjzfl/A1/YxDvRCZz8wvZvmapQnKwFQ==",
+      "license": "ISC",
+      "dependencies": {
+        "jsbi": "^4.3.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/@lukeed/csprng": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@lukeed/csprng/-/csprng-1.1.0.tgz",
@@ -7831,6 +7844,12 @@
         "js-yaml": "bin/js-yaml.js"
       }
     },
+    "node_modules/jsbi": {
+      "version": "4.3.2",
+      "resolved": "https://registry.npmjs.org/jsbi/-/jsbi-4.3.2.tgz",
+      "integrity": "sha512-9fqMSQbhJykSeii05nxKl4m6Eqn2P6rOlYiS+C5Dr/HPIU/7yZxu5qzbs40tgaFORiw2Amd0mirjxatXYMkIew==",
+      "license": "Apache-2.0"
+    },
     "node_modules/jsesc": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-3.1.0.tgz",