diff --git a/library/build.gradle b/library/build.gradle
index 3c68db6..4627a83 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -11,6 +11,7 @@ compileTestKotlin {
 }
 
 dependencies {
+    implementation dep.threetenbp
     testImplementation dep.junit.core
 }
 
diff --git a/library/src/main/java/com/aminography/primecalendar/hijri/HijriCalendar.kt b/library/src/main/java/com/aminography/primecalendar/hijri/HijriCalendar.kt
index f0fd2aa..b1e820f 100644
--- a/library/src/main/java/com/aminography/primecalendar/hijri/HijriCalendar.kt
+++ b/library/src/main/java/com/aminography/primecalendar/hijri/HijriCalendar.kt
@@ -4,8 +4,17 @@ import com.aminography.primecalendar.base.BaseCalendar
 import com.aminography.primecalendar.common.CalendarType
 import com.aminography.primecalendar.common.DateHolder
 import java.text.DateFormatSymbols
-import java.util.*
-import java.util.Calendar.*
+import java.util.Calendar.DAY_OF_MONTH
+import java.util.Calendar.DAY_OF_WEEK
+import java.util.Calendar.DAY_OF_WEEK_IN_MONTH
+import java.util.Calendar.DAY_OF_YEAR
+import java.util.Calendar.MONTH
+import java.util.Calendar.SATURDAY
+import java.util.Calendar.WEEK_OF_MONTH
+import java.util.Calendar.WEEK_OF_YEAR
+import java.util.Calendar.YEAR
+import java.util.Locale
+import java.util.TimeZone
 
 
 /**
@@ -138,6 +147,9 @@ class HijriCalendar @JvmOverloads constructor(
 
     @Suppress("unused")
     companion object {
+        @JvmStatic
+        var shiftDate: Int = 0
+
         const val DEFAULT_FIRST_DAY_OF_WEEK = SATURDAY
         const val DEFAULT_LOCALE = "ar"
 
diff --git a/library/src/main/java/com/aminography/primecalendar/hijri/HijriCalendarUtils.kt b/library/src/main/java/com/aminography/primecalendar/hijri/HijriCalendarUtils.kt
index 06c494c..0ff7e70 100644
--- a/library/src/main/java/com/aminography/primecalendar/hijri/HijriCalendarUtils.kt
+++ b/library/src/main/java/com/aminography/primecalendar/hijri/HijriCalendarUtils.kt
@@ -2,11 +2,18 @@ package com.aminography.primecalendar.hijri
 
 import com.aminography.primecalendar.common.DateHolder
 import com.aminography.primecalendar.hijri.HijriCalendar.Companion.DEFAULT_LOCALE
-import java.time.LocalDate
-import java.time.chrono.HijrahDate
-import java.time.temporal.ChronoField
-import java.util.*
-import java.util.Calendar.*
+import com.aminography.primecalendar.hijri.HijriCalendar.Companion.shiftDate
+import org.threeten.bp.LocalDate
+import org.threeten.bp.chrono.HijrahDate
+import org.threeten.bp.temporal.ChronoField
+import java.util.Calendar.FRIDAY
+import java.util.Calendar.MONDAY
+import java.util.Calendar.SATURDAY
+import java.util.Calendar.SUNDAY
+import java.util.Calendar.THURSDAY
+import java.util.Calendar.TUESDAY
+import java.util.Calendar.WEDNESDAY
+import java.util.Locale
 
 /**
  * @author aminography
@@ -231,6 +238,7 @@ object HijriCalendarUtils {
 
     internal fun gregorianToHijri(gregorian: DateHolder): DateHolder {
         val gregorianDate = LocalDate.of(gregorian.year, gregorian.month + 1, gregorian.dayOfMonth)
+            .run { plusDays(shiftDate.toLong()) }
         val hijriDate = HijrahDate.from(gregorianDate)
         return DateHolder(hijriDate.get(ChronoField.YEAR), hijriDate.get(ChronoField.MONTH_OF_YEAR) - 1, hijriDate.get(ChronoField.DAY_OF_MONTH))
     }
@@ -238,7 +246,7 @@ object HijriCalendarUtils {
     internal fun hijriToGregorian(hijri: DateHolder): DateHolder {
         val hijriDate = HijrahDate.of(hijri.year, hijri.month + 1, hijri.dayOfMonth)
         val gregorianDate = LocalDate.from(hijriDate)
+            .run { minusDays(shiftDate.toLong()) }
         return DateHolder(gregorianDate.get(ChronoField.YEAR), gregorianDate.get(ChronoField.MONTH_OF_YEAR) - 1, gregorianDate.get(ChronoField.DAY_OF_MONTH))
     }
-
 }
diff --git a/library/src/test/java/com/aminography/primecalendar/ExampleUnitTest.kt b/library/src/test/java/com/aminography/primecalendar/ExampleUnitTest.kt
index 3c24560..5116926 100644
--- a/library/src/test/java/com/aminography/primecalendar/ExampleUnitTest.kt
+++ b/library/src/test/java/com/aminography/primecalendar/ExampleUnitTest.kt
@@ -274,6 +274,8 @@ class ExampleUnitTest {
         val persian = PersianCalendar()
         println(persian.longDateString)
 
+        HijriCalendar.shiftDate = 1
+
         val hijri = HijriCalendar()
         println(hijri.longDateString)
 
diff --git a/settings.gradle b/settings.gradle
index 7e5ec7e..a09f2b2 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -5,6 +5,7 @@ enableFeaturePreview('VERSION_CATALOGS')
 dependencyResolutionManagement {
     versionCatalogs {
         dep {
+            alias('threetenbp').to('org.threeten:threetenbp:1.5.2')
             alias('junit-core').to('junit:junit:4.13.2')
         }