diff --git a/package-lock.json b/package-lock.json
index 4235450..92da71c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,6 @@
         "@dotcom-reliability-kit/logger": "^3.0.3",
         "aws-sdk": "^2.6.10",
         "fetchres": "^1.5.1",
-        "moment": "^2.29.4",
         "ms": "^2.0.0",
         "node-fetch": "^2.6.7"
       },
@@ -7685,14 +7684,6 @@
       "integrity": "sha1-z4tP9PKWQGdNbN0CsOO8UjwrvcA=",
       "dev": true
     },
-    "node_modules/moment": {
-      "version": "2.29.4",
-      "resolved": "https://registry.npmjs.org/moment/-/moment-2.29.4.tgz",
-      "integrity": "sha512-5LC9SOxjSc2HF6vO2CyuTDNivEdoz2IvyJJGj6X8DJ0eFyfszE0QiEd+iXmBvUP3WHxSjFH/vIsA0EN00cgr8w==",
-      "engines": {
-        "node": "*"
-      }
-    },
     "node_modules/ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
@@ -18570,11 +18561,6 @@
       "integrity": "sha1-z4tP9PKWQGdNbN0CsOO8UjwrvcA=",
       "dev": true
     },
-    "moment": {
-      "version": "2.29.4",
-      "resolved": "https://registry.npmjs.org/moment/-/moment-2.29.4.tgz",
-      "integrity": "sha512-5LC9SOxjSc2HF6vO2CyuTDNivEdoz2IvyJJGj6X8DJ0eFyfszE0QiEd+iXmBvUP3WHxSjFH/vIsA0EN00cgr8w=="
-    },
     "ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
diff --git a/package.json b/package.json
index 01b0ed0..f8b7d6f 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,6 @@
     "@dotcom-reliability-kit/logger": "^3.0.3",
     "aws-sdk": "^2.6.10",
     "fetchres": "^1.5.1",
-    "moment": "^2.29.4",
     "ms": "^2.0.0",
     "node-fetch": "^2.6.7"
   },
diff --git a/src/checks/cloudWatchThreshold.check.js b/src/checks/cloudWatchThreshold.check.js
index cecbd16..cba3d6a 100644
--- a/src/checks/cloudWatchThreshold.check.js
+++ b/src/checks/cloudWatchThreshold.check.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const AWS = require('aws-sdk');
-const moment = require('moment');
 const logger = require('@dotcom-reliability-kit/logger');
 const status = require('./status');
 const Check = require('./check');
@@ -32,11 +31,12 @@ class CloudWatchThresholdCheck extends Check {
 	generateParams() {
 		// use a larger window when gathering stats, because CloudWatch
 		// can take its sweet time with populating new datapoints.
-		let timeWindow = this.samplePeriod * 1.5;
-		const now = moment();
+		let timeWindowInMs = this.samplePeriod * 1.5 * 1000;
+		const now = new Date();
+		const startTime = new Date(now.getTime() - timeWindowInMs);
 		return {
 			EndTime: now.toISOString(),
-			StartTime: now.subtract(timeWindow, 'seconds').toISOString(),
+			StartTime: startTime.toISOString(),
 			MetricName: this.cloudWatchMetricName,
 			Namespace: this.cloudWatchNamespace,
 			Period: this.samplePeriod,
diff --git a/src/checks/fastlyKeyExpiration.check.js b/src/checks/fastlyKeyExpiration.check.js
index 0bbd089..24d1335 100644
--- a/src/checks/fastlyKeyExpiration.check.js
+++ b/src/checks/fastlyKeyExpiration.check.js
@@ -1,9 +1,10 @@
 const fetch = require('node-fetch');
-const moment = require('moment');
 const logger = require('@dotcom-reliability-kit/logger');
 const Check = require('./check');
 const status = require('./status');
 
+const twoWeeksInDays = 2 * 7;
+
 const fastlyApiEndpoint = 'https://api.fastly.com/tokens/self';
 const defaultPanicGuide =
 	'Generate a new key in your own Fastly account with the same permissions and update it in Vault or your app';
@@ -79,8 +80,15 @@ class FastlyKeyExpirationCheck extends Check {
 	}
 
 	parseStringDate(stringDate) {
-		const date = moment(stringDate, 'YYYY-MM-DDTHH:mm:ssZ');
-		if (!date.isValid()) {
+		let dateIsValid = true;
+		let date;
+		try {
+			date = new Date(stringDate);
+			dateIsValid = !Number.isNaN(date.getDate());
+		} catch (error) {
+			dateIsValid = false;
+		}
+		if (!dateIsValid) {
 			logger.warn(`Invalid Fastly Key expiration date ${stringDate}`);
 			this.setState(this.states.FAILED_DATE);
 			throw new Error('Invalid date');
@@ -95,12 +103,13 @@ class FastlyKeyExpirationCheck extends Check {
 	}
 
 	checkExpirationDate(expirationDate) {
-		const now = moment();
-		const limitDate = moment().add(2, 'weeks');
+		const now = new Date();
+		const limitDate = new Date();
+		limitDate.setDate(now.getDate() + twoWeeksInDays);
 		switch (true) {
-			case expirationDate.isAfter(limitDate):
+			case expirationDate > limitDate:
 				return this.states.PASSED;
-			case expirationDate.isBefore(now):
+			case expirationDate <= now:
 				return this.states.FAILED_URGENT_VALIDATION;
 			default:
 				return this.states.FAILED_VALIDATION;