start ChangeLog entry

doc/ChangeLog

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+Tag name:
+Originator(s): eaton
+Date:
+One-line Summary: Bugfix to allow multiple monthly avg history files
+Github PR URL:
+
+Purpose of changes (include the issue number and title text for each relevant GitHub issue):
+
+#1000 - Output of more than 1 monthly average history file is broken.
+
+. resolves #1000
+
+Describe any changes made to build system: none
+
+Describe any changes made to the namelist: none
+
+List any changes to the defaults for the boundary datasets: none
+
+Describe any substantial timing or memory changes: none
+
+Code reviewed by:
+
+List all files eliminated: none
+
+List all files added and what they do: none
+
+List all existing files that have been modified, and describe the changes:
+
+src/control/cam_history.F90
+. subroutine wshist
+  - add new local variables to store the year, month, and day components of
+    the time interval midpoint date.
+
+If there were any failures reported from running test_driver.sh on any test
+platform, and checkin with these failures has been OK'd by the gatekeeper,
+then copy the lines from the td.*.status files for the failed tests to the
+appropriate machine below.  All failed tests must be justified.
+
+derecho/intel/aux_cam:
+
+izumi/nag/aux_cam:
+
+izumi/gnu/aux_cam:
+
+CAM tag used for the baseline comparison tests if different than previous
+tag:
+
+Summarize any changes to answers: BFB
+
+===============================================================
+===============================================================
+
 Tag name: cam6_3_150
 Originator(s): megandevlan, peverwhee
 Date: Feb 23, 2024