diff --git a/packages/cubejs-schema-compiler/src/adapter/BaseQuery.js b/packages/cubejs-schema-compiler/src/adapter/BaseQuery.js
index 037361854675c..02a93198d340c 100644
--- a/packages/cubejs-schema-compiler/src/adapter/BaseQuery.js
+++ b/packages/cubejs-schema-compiler/src/adapter/BaseQuery.js
@@ -4475,12 +4475,15 @@ export class BaseQuery {
   }
 
   parseCronSyntax(every) {
-    // One of the years that start from monday (first day of week)
-    // Mon, 01 Jan 2018 00:00:00 GMT
-    const startDate = 1514764800000;
+    // Use the Unix epoch as the reference point for calculating dayOffset.
+    // The refresh key SQL formula is: FLOOR((unix_timestamp - dayOffset) / interval)
+    // Since Unix timestamps are measured from Thu, 01 Jan 1970 00:00:00 UTC,
+    // week boundaries naturally fall on Thursdays when dividing by 604800 (1 week).
+    // By calculating dayOffset from the epoch to the first cron fire time,
+    // we correctly shift the boundaries to align with the desired day of week.
     const opt = {
       utc: true,
-      currentDate: new Date(startDate)
+      currentDate: new Date(0) // Unix epoch
     };
 
     try {
@@ -4488,14 +4491,15 @@ export class BaseQuery {
       let dayOffset = interval.next().getTime();
       const dayOffsetPrev = interval.prev().getTime();
 
-      if (dayOffsetPrev === startDate) {
-        dayOffset = startDate;
+      // If the cron fires exactly at the epoch, use 0 as dayOffset
+      if (dayOffsetPrev === 0) {
+        dayOffset = 0;
       }
 
       return {
         start: interval.next(),
         end: interval.next(),
-        dayOffset: (dayOffset - startDate) / 1000,
+        dayOffset: dayOffset / 1000, // Convert from ms to seconds
       };
     } catch (err) {
       throw new UserError(`Invalid cron string '${every}' in refreshKey (${err})`);
diff --git a/packages/cubejs-schema-compiler/test/unit/base-query.test.ts b/packages/cubejs-schema-compiler/test/unit/base-query.test.ts
index 26bf4782b1558..b7e48f390cd90 100644
--- a/packages/cubejs-schema-compiler/test/unit/base-query.test.ts
+++ b/packages/cubejs-schema-compiler/test/unit/base-query.test.ts
@@ -1250,7 +1250,7 @@ describe('SQL Generation', () => {
         .toEqual([`FLOOR((${utcOffset} + EXTRACT(EPOCH FROM NOW()) - 1800) / 3600)`, false, expect.any(BaseQuery)]);
 
       expect(query.everyRefreshKeySql({ every: '30 5 * * 5', timezone }))
-        .toEqual([`FLOOR((${utcOffset} + EXTRACT(EPOCH FROM NOW()) - 365400) / 604800)`, false, expect.any(BaseQuery)]);
+        .toEqual([`FLOOR((${utcOffset} + EXTRACT(EPOCH FROM NOW()) - 106200) / 604800)`, false, expect.any(BaseQuery)]);
 
       for (let i = 1; i < 59; i++) {
         expect(query.everyRefreshKeySql({ every: `${i} * * * *`, timezone }))