diff --git a/reasoning_gym/arithmetic/__init__.py b/reasoning_gym/arithmetic/__init__.py
index f886e4a0..c53eed6d 100644
--- a/reasoning_gym/arithmetic/__init__.py
+++ b/reasoning_gym/arithmetic/__init__.py
@@ -23,7 +23,7 @@ from .number_format import NumberFormatConfig, NumberFormatCurriculum, NumberFor
 from .power_function import PowerFunctionConfig, PowerFunctionCurriculum, PowerFunctionDataset
 from .prime_factorization import PrimeFactorizationConfig, PrimeFactorizationCurriculum, PrimeFactorizationDataset
 from .products import ProductsConfig, ProductsDataset
-from .time_intervals import TimeIntervalsConfig, TimeIntervalsDataset
+from .time_intervals import TimeIntervalsConfig, TimeIntervalsCurriculum, TimeIntervalsDataset
 
 __all__ = [
     "BasicArithmeticDataset",
@@ -57,6 +57,7 @@ __all__ = [
     "GSMSymbolicDataset",
     "TimeIntervalsConfig",
     "TimeIntervalsDataset",
+    "TimeIntervalsCurriculum",
     "CountBitsConfig",
     "CountBitsDataset",
     "CountBitsCurriculum",
diff --git a/reasoning_gym/arithmetic/time_intervals.py b/reasoning_gym/arithmetic/time_intervals.py
index eb23b232..c08de217 100644
--- a/reasoning_gym/arithmetic/time_intervals.py
+++ b/reasoning_gym/arithmetic/time_intervals.py
@@ -6,6 +6,7 @@ from typing import Optional
 import pytz
 from dateutil import parser
 
+from ..coaching import AttributeType, BaseCurriculum, ScalarAttributeDefinition
 from ..factory import ProceduralDataset, register_dataset
 
 
@@ -138,6 +139,10 @@ class TimeIntervalsDataset(ProceduralDataset):
                 "end_time": end_dt,
                 "format": format_str,
                 "expected_format": expected_format,
+                "difficulty": {
+                    "max_time_difference_seconds": self.config.max_time_difference_seconds,
+                    "max_date_difference_days": self.config.max_date_difference_days,
+                },
             },
         }
 
@@ -319,5 +324,32 @@ class TimeIntervalsDataset(ProceduralDataset):
         return 0.0
 
 
+class TimeIntervalsCurriculum(BaseCurriculum):
+    def __init__(self):
+        super().__init__(TimeIntervalsCurriculum.__name__, TimeIntervalsConfig)
+
+        # Define attributes
+        self._define_attributes(
+            ScalarAttributeDefinition(
+                name="max_time_difference_seconds",
+                field_name="max_time_difference_seconds",
+                levels=[60, 24 * 60 * 60, 7 * 24 * 60 * 60, 30 * 24 * 60 * 60, 365 * 24 * 60 * 60],
+                default_level=0,
+                description="Maximum time difference in seconds",
+                attr_type=AttributeType.STATIC,
+                min_value=1,
+            ),
+            ScalarAttributeDefinition(
+                name="max_date_difference_days",
+                field_name="max_date_difference_days",
+                levels=[1, 7, 30, 365, 5 * 365],
+                default_level=0,
+                description="Maximum date difference in days",
+                attr_type=AttributeType.STATIC,
+                min_value=1,
+            ),
+        )
+
+
 # Register the dataset
-register_dataset("time_intervals", TimeIntervalsDataset, TimeIntervalsConfig)
+register_dataset("time_intervals", TimeIntervalsDataset, TimeIntervalsConfig, TimeIntervalsCurriculum)
diff --git a/tests/test_time_intervals.py b/tests/test_time_intervals.py
index 4e95f778..3d9a8a4f 100644
--- a/tests/test_time_intervals.py
+++ b/tests/test_time_intervals.py
@@ -2,7 +2,7 @@ from datetime import date, datetime
 
 import pytest
 
-from reasoning_gym.arithmetic import TimeIntervalsConfig, TimeIntervalsDataset
+from reasoning_gym.arithmetic import TimeIntervalsConfig, TimeIntervalsCurriculum, TimeIntervalsDataset
 
 
 def test_time_intervals_config_validation():
@@ -111,3 +111,28 @@ def test_time_format_patterns():
         # Verify end is after start
         assert end_dt >= start_dt, item["question"]
         assert dataset.score_answer(item["answer"], item) == 1.0
+
+
+def test_time_intervals_curriculum():
+    curriculum = TimeIntervalsCurriculum()
+
+    base_value = {"size": 150, "seed": 1}
+
+    base_cfg: TimeIntervalsConfig = curriculum.generate_configuration(base_value)
+    assert base_cfg.seed == 1
+    assert base_cfg.size == 150
+    assert base_cfg.max_time_difference_seconds == 60
+    assert base_cfg.max_date_difference_days == 1
+
+    # test incrementing attribute levels
+    curriculum.increment_attr_level("max_time_difference_seconds")
+    curriculum.increment_attr_level("max_date_difference_days")
+    increased_cfg = curriculum.generate_configuration(base_value)
+    assert increased_cfg.max_time_difference_seconds == 24 * 60 * 60
+    assert increased_cfg.max_date_difference_days == 7
+
+    # test decrementing attribute level
+    curriculum.decrement_attr_level("max_time_difference_seconds")
+    partially_decreased_cfg = curriculum.generate_configuration(base_value)
+    assert partially_decreased_cfg.max_time_difference_seconds == 60
+    assert partially_decreased_cfg.max_date_difference_days == 7