diff --git a/src/weather/services/weather.ts b/src/weather/services/weather.ts
index ca8f4bb..9bfdf31 100644
--- a/src/weather/services/weather.ts
+++ b/src/weather/services/weather.ts
@@ -7,7 +7,7 @@ import type {
   Weather,
   WeatherResponse,
 } from "../interfaces";
-import { formatMilliseconds } from "../utils/time-formatter";
+import { formatMilliseconds } from "../utils/time";
 
 const FORECAST_MAX_HOURS = 10;
 const UNIT_SYSTEM = "metric";
diff --git a/src/weather/utils/__tests__/data/index.ts b/src/weather/utils/__tests__/data/index.ts
new file mode 100644
index 0000000..0a6eac2
--- /dev/null
+++ b/src/weather/utils/__tests__/data/index.ts
@@ -0,0 +1,95 @@
+const MINUTE = 60000;
+const HOUR = MINUTE * 60;
+
+export const ES_LOCALE_TEST_SUITE = [
+  [0, "00:00"],
+  [MINUTE, "00:01"],
+  [2 * MINUTE, "00:02"],
+  [HOUR, "01:00"],
+  [2 * HOUR, "02:00"],
+  [12 * HOUR, "12:00"],
+  [13 * HOUR, "13:00"],
+  [23 * HOUR, "23:00"],
+  [24 * HOUR, "00:00"],
+] as const;
+export const EN_LOCALE_TEST_SUITE = [
+  [0, "12:00 AM"],
+  [MINUTE, "12:01 AM"],
+  [2 * MINUTE, "12:02 AM"],
+  [HOUR, "01:00 AM"],
+  [2 * HOUR, "02:00 AM"],
+  [12 * HOUR, "12:00 PM"],
+  [13 * HOUR, "01:00 PM"],
+  [23 * HOUR, "11:00 PM"],
+  [24 * HOUR, "12:00 AM"],
+] as const;
+
+export const IS_DAY_TEST_SUITE = [
+  {
+    time: new Date(Date.UTC(2022, 1, 1, 0, 0, 0)), // 00:00
+    sunrise: new Date(Date.UTC(2022, 1, 1, 6, 0, 0)), // 06:00
+    sunset: new Date(Date.UTC(2022, 1, 1, 18, 0, 0)), // 18:00
+    result: false,
+  },
+  {
+    time: new Date(Date.UTC(2022, 1, 1, 12, 0, 0)), // 12:00
+    sunrise: new Date(Date.UTC(2022, 1, 1, 6, 0, 0)), // 06:00
+    sunset: new Date(Date.UTC(2022, 1, 1, 18, 0, 0)), // 18:00
+    result: true,
+  },
+  {
+    time: new Date(Date.UTC(2022, 1, 1, 23, 59, 59)), // 23:59
+    sunrise: new Date(Date.UTC(2022, 1, 1, 6, 0, 0)), // 06:00
+    sunset: new Date(Date.UTC(2022, 1, 1, 18, 0, 0)), // 18:00
+    result: false,
+  },
+  {
+    time: new Date(Date.UTC(2022, 1, 2, 0, 0, 0)), // 00:00
+    sunrise: new Date(Date.UTC(2022, 1, 1, 6, 0, 0)), // 06:00
+    sunset: new Date(Date.UTC(2022, 1, 1, 18, 0, 0)), // 18:00
+    result: false,
+  },
+  {
+    time: new Date(Date.UTC(2022, 1, 1, 5, 59, 59)), // 05:59
+    sunrise: new Date(Date.UTC(2022, 1, 1, 6, 0, 0)), // 06:00
+    sunset: new Date(Date.UTC(2022, 1, 1, 18, 0, 0)), // 18:00
+    result: false,
+  },
+  {
+    time: new Date(Date.UTC(2022, 1, 1, 18, 0, 1)), // 18:00
+    sunrise: new Date(Date.UTC(2022, 1, 1, 6, 0, 0)), // 06:00
+    sunset: new Date(Date.UTC(2022, 1, 1, 18, 0, 0)), // 18:00
+    result: false,
+  },
+  {
+    time: new Date(Date.UTC(2022, 1, 1, 18, 0, 0)), // 18:00
+    sunrise: new Date(Date.UTC(2022, 1, 1, 6, 0, 0)), // 06:00
+    sunset: new Date(Date.UTC(2022, 1, 1, 18, 0, 0)), // 18:00
+    result: true,
+  },
+  {
+    time: new Date(Date.UTC(2022, 1, 1, 5, 0, 0)), // 05:00
+    sunrise: new Date(Date.UTC(2022, 1, 1, 6, 0, 0)), // 06:00
+    sunset: new Date(Date.UTC(2022, 1, 1, 18, 0, 0)), // 18:00
+    result: false,
+  },
+  {
+    time: new Date(Date.UTC(2022, 1, 1, 19, 0, 0)), // 19:00
+    sunrise: new Date(Date.UTC(2022, 1, 1, 6, 0, 0)), // 06:00
+    sunset: new Date(Date.UTC(2022, 1, 1, 18, 0, 0)), // 18:00
+    result: false,
+  },
+  // Different year dates
+  {
+    time: new Date(Date.UTC(2023, 1, 1, 12, 0, 0)), // 12:00
+    sunrise: new Date(Date.UTC(2022, 1, 1, 6, 0, 0)), // 06:00
+    sunset: new Date(Date.UTC(2022, 1, 1, 18, 0, 0)), // 18:00
+    result: true,
+  },
+  {
+    time: new Date(Date.UTC(2023, 1, 1, 0, 0, 0)), // 0:00
+    sunrise: new Date(Date.UTC(2022, 1, 1, 6, 0, 0)), // 06:00
+    sunset: new Date(Date.UTC(2022, 1, 1, 18, 0, 0)), // 18:00
+    result: false,
+  },
+] as const;
diff --git a/src/weather/utils/__tests__/time-formatter.spec.ts b/src/weather/utils/__tests__/time-formatter.spec.ts
deleted file mode 100644
index e61035d..0000000
--- a/src/weather/utils/__tests__/time-formatter.spec.ts
+++ /dev/null
@@ -1,45 +0,0 @@
-import { formatMilliseconds } from "../time-formatter";
-
-const MINUTE = 60000;
-const HOUR = MINUTE * 60;
-
-const ES_LOCALE_TEST_SUITE = [
-  [0, "00:00"],
-  [MINUTE, "00:01"],
-  [2 * MINUTE, "00:02"],
-  [HOUR, "01:00"],
-  [2 * HOUR, "02:00"],
-  [12 * HOUR, "12:00"],
-  [13 * HOUR, "13:00"],
-  [23 * HOUR, "23:00"],
-  [24 * HOUR, "00:00"],
-] as const;
-const EN_LOCALE_TEST_SUITE = [
-  [0, "12:00 AM"],
-  [MINUTE, "12:01 AM"],
-  [2 * MINUTE, "12:02 AM"],
-  [HOUR, "01:00 AM"],
-  [2 * HOUR, "02:00 AM"],
-  [12 * HOUR, "12:00 PM"],
-  [13 * HOUR, "01:00 PM"],
-  [23 * HOUR, "11:00 PM"],
-  [24 * HOUR, "12:00 AM"],
-] as const;
-
-describe("Weather Service Time formatter", () => {
-  const esLocale = "es-ES";
-  it.each(ES_LOCALE_TEST_SUITE)(
-    `should format time for ${esLocale}`,
-    (time, result) => {
-      expect(formatMilliseconds({ time, locale: esLocale })).toBe(result);
-    }
-  );
-
-  const enLocale = "en-US";
-  it.each(EN_LOCALE_TEST_SUITE)(
-    `should format time for ${enLocale}`,
-    (time, result) => {
-      expect(formatMilliseconds({ time, locale: enLocale })).toBe(result);
-    }
-  );
-});
diff --git a/src/weather/utils/__tests__/time.spec.ts b/src/weather/utils/__tests__/time.spec.ts
new file mode 100644
index 0000000..e05e73a
--- /dev/null
+++ b/src/weather/utils/__tests__/time.spec.ts
@@ -0,0 +1,40 @@
+import { formatMilliseconds, isDayTime } from "../time";
+import {
+  EN_LOCALE_TEST_SUITE,
+  ES_LOCALE_TEST_SUITE,
+  IS_DAY_TEST_SUITE,
+} from "./data";
+
+describe("Weather Service Time formatter", () => {
+  const esLocale = "es-ES";
+  it.each(ES_LOCALE_TEST_SUITE)(
+    `should format time for ${esLocale}`,
+    (time, result) => {
+      expect(formatMilliseconds({ time, locale: esLocale })).toBe(result);
+    }
+  );
+
+  const enLocale = "en-US";
+  it.each(EN_LOCALE_TEST_SUITE)(
+    `should format time for ${enLocale}`,
+    (time, result) => {
+      expect(formatMilliseconds({ time, locale: enLocale })).toBe(result);
+    }
+  );
+
+  IS_DAY_TEST_SUITE.forEach(({ time, sunrise, sunset, result }) => {
+    it(`should correctly determine if it is day time for ${formatMilliseconds({
+      time: time.getTime(),
+      locale: enLocale,
+      timeZone: "UTC",
+    })}`, () => {
+      expect(
+        isDayTime({
+          time,
+          sunrise,
+          sunset,
+        })
+      ).toBe(result);
+    });
+  });
+});
diff --git a/src/weather/utils/time-formatter.ts b/src/weather/utils/time-formatter.ts
deleted file mode 100644
index 5cc4938..0000000
--- a/src/weather/utils/time-formatter.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-interface formatMillisecondsOptions {
-    time: number;
-    locale: string;
-    timeZone?: string;
-}
-
-export const formatMilliseconds = ({ time, locale, timeZone = 'UTC' }: formatMillisecondsOptions) => {
-    const timeFormatter = new Intl.DateTimeFormat(
-        locale,
-        {
-            hour: '2-digit',
-            minute: '2-digit',
-            timeZone
-        }
-    );
-
-    return timeFormatter.format(new Date(time));
-}
\ No newline at end of file
diff --git a/src/weather/utils/time.ts b/src/weather/utils/time.ts
new file mode 100644
index 0000000..6cf2735
--- /dev/null
+++ b/src/weather/utils/time.ts
@@ -0,0 +1,70 @@
+interface formatMillisecondsOptions {
+  time: number;
+  locale: string;
+  timeZone?: string;
+}
+
+/**
+ * Formats a given time in milliseconds to a localized time string.
+ *
+ * @param {Object} options - The options object.
+ * @param {number} options.time - The time in milliseconds since the Unix epoch (January 1, 1970 00:00:00 UTC).
+ * @param {string} options.locale - A string with a BCP 47 language tag, or an array of such strings, to specify the locale.
+ * @param {string} [options.timeZone="UTC"] - An optional string representing the time zone to use. Defaults to "UTC".
+ * @returns {string} - A string representing the formatted time according to the specified locale and time zone.
+ *
+ * @example
+ * // Example usage:
+ * const formattedTime = formatMilliseconds({ time: Date.now(), locale: 'en-US', timeZone: 'America/New_York' });
+ * console.log(formattedTime); // Output: "02:30 PM" (depending on the current time)
+ */
+export const formatMilliseconds = ({
+  time,
+  locale,
+  timeZone = "UTC",
+}: formatMillisecondsOptions) => {
+  const timeFormatter = new Intl.DateTimeFormat(locale, {
+    hour: "2-digit",
+    minute: "2-digit",
+    timeZone,
+  });
+
+  return timeFormatter.format(new Date(time));
+};
+
+interface IsDayTimeProps {
+  time: Date;
+  sunrise: Date;
+  sunset: Date;
+}
+
+/**
+ * Determines whether a given time is during the day, based on sunrise and sunset times,
+ * ignoring the date component and only considering the hours and minutes.
+ *
+ * @param {Object} params - The parameters object.
+ * @param {Date} params.time - The current time to check.
+ * @param {Date} params.sunrise - The time of sunrise.
+ * @param {Date} params.sunset - The time of sunset.
+ * @returns {boolean} - Returns `true` if the time is between sunrise and sunset, otherwise `false`.
+ */
+export const isDayTime = ({
+  time,
+  sunrise,
+  sunset,
+}: IsDayTimeProps): boolean => {
+  const getTimeInMilliseconds = (date: Date) =>
+    date.getUTCHours() * 60 * 60 +
+    date.getUTCMinutes() * 60 +
+    date.getUTCSeconds() * 1000 +
+    date.getUTCMilliseconds();
+
+  const timeInMilliseconds = getTimeInMilliseconds(time);
+  const sunriseInMilliseconds = getTimeInMilliseconds(sunrise);
+  const sunsetInMilliseconds = getTimeInMilliseconds(sunset);
+
+  return (
+    timeInMilliseconds >= sunriseInMilliseconds &&
+    timeInMilliseconds <= sunsetInMilliseconds
+  );
+};