diff --git a/decasu/region_mapper.py b/decasu/region_mapper.py
index fbebd02..d11ee09 100644
--- a/decasu/region_mapper.py
+++ b/decasu/region_mapper.py
@@ -5,6 +5,7 @@
 import esutil
 import time
 from functools import lru_cache
+from astropy.time import Time
 
 import coord
 
@@ -281,6 +282,12 @@ def __call__(self, hpix_or_tilename, indices, clobber=False):
                     value = (np.tan(zenith)**2.)*np.sin(2*par_angle)
                 elif map_type == 'parallactic':
                     value = par_angle
+                elif map_type == 'mjd':
+                    value = dg.table[self.config.mjd_field][ind]
+                elif map_type == 'fraction_of_year':
+                    value = self._compute_fraction_of_year(dg.table[self.config.mjd_field][ind])
+                elif map_type == 'fraction_of_day':
+                    value = self._compute_fraction_of_day(dg.table[self.config.mjd_field][ind])
                 else:
                     value = dg.table[map_type][ind]
 
@@ -784,6 +791,38 @@ def _get_maskcircle_from_row(self, table_row):
                                        value=1)
         return maskcircle
 
+    def _compute_fraction_of_year(self, mjds):
+        """Compute day of year.
+
+        Parameters
+        ----------
+        mjd : `np.ndarray`
+            Array of MJD values.
+
+        Returns
+        -------
+        fraction_of_year : `np.ndarray`
+            Fraction of year for MJDs.
+        """
+        t = Time(mjds, format='mjd')
+        decimal_year = t.to_value('decimalyear')
+        return decimal_year - np.floor(decimal_year)
+
+    def _compute_fraction_of_day(self, mjds):
+        """Compute fraction of day.
+
+        Parameters
+        ----------
+        mjd : `np.ndarray`
+            Array of MJD values.
+
+        Returns
+        -------
+        fraction_of_day : `np.ndarray`
+            Fraction of day (UTC) for MJDs.
+        """
+        return mjds - np.floor(mjds)
+
 
 @lru_cache(maxsize=200)
 def _get_numpy_corners_from_detector(detector, amp_name):
diff --git a/tests/configs/config_tilename.yaml b/tests/configs/config_tilename.yaml
index 0990e1e..02e1c2e 100644
--- a/tests/configs/config_tilename.yaml
+++ b/tests/configs/config_tilename.yaml
@@ -16,3 +16,6 @@ map_types:
   skybrite: ['wmean', 'wmean-scaled', 'min-scaled', 'max-scaled', 'mean', 'mean-scaled']
   skyvar: ['wmean', 'min']
   fwhm: ['wmean']
+  mjd: ['wmean']
+  fraction_of_year: ['wmean']
+  fraction_of_day: ['wmean']
diff --git a/tests/test_tilename.py b/tests/test_tilename.py
index 6127c23..ff53678 100644
--- a/tests/test_tilename.py
+++ b/tests/test_tilename.py
@@ -67,6 +67,9 @@ def test_tilename(self):
         expected_dict['skysigma_wmean'] = [51.4, 77.2, 'float64']
         expected_dict['skyvar_wmean'] = [2950.0, 5991.0, 'float64']
         expected_dict['skyvar_min'] = [2705.0, 5991.0, 'float64']
+        expected_dict['mjd_wmean'] = [56602.0, 57335.0, 'float64']
+        expected_dict['fraction_of_year_wmean'] = [0.67, 0.94, 'float64']
+        expected_dict['fraction_of_day_wmean'] = [0.03, 0.23, 'float64']
 
         self.check_expected_maps_tile(expected_dict, 'DES0003-5457', band)
 
@@ -97,6 +100,9 @@ def test_tilename(self):
         expected_dict['skysigma_wmean'] = [50.1, 78.7, 'float64']
         expected_dict['skyvar_wmean'] = [2520.0, 6223.0, 'float64']
         expected_dict['skyvar_min'] = [2503.0, 6223.0, 'float64']
+        expected_dict['mjd_wmean'] = [56602.0, 57259.0, 'float64']
+        expected_dict['fraction_of_year_wmean'] = [0.63, 0.94, 'float64']
+        expected_dict['fraction_of_day_wmean'] = [0.05, 0.28, 'float64']
 
         self.check_expected_maps_tile(expected_dict, 'DES2358-5457', band)