From 2c754ed9de956b303e12e82b9ad70debed3ee3cc Mon Sep 17 00:00:00 2001
From: Erik Oosterop <erik.oosterop.khesw@aleeas.com>
Date: Sat, 24 Feb 2024 16:54:48 +0000
Subject: [PATCH] Fix date <> integer conversion

---
 CHANGELOG.md                   |  4 ++++
 pyproject.toml                 |  2 +-
 src/mimosa/dateswithoutdata.py | 10 +++++-----
 3 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4dd4ac6..f37b047 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 <!-- insertion marker -->
 ## [Unreleased]
 
+## [0.4.2] 2024-02-23
+### Fixed
+- Date conversion to integer and back
+
 ## [0.4.1] 2024-02-23
 ### Added
 - Functionality to get a list of date for which no data exists in the target
diff --git a/pyproject.toml b/pyproject.toml
index d00db65..9e971e2 100755
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ disallow_incomplete_defs = true
 
 [tool.poetry]
 name = "ternyxmimosa"
-version = "0.4.1"
+version = "0.4.2"
 description = "A minimal modern data stack with working data pipelines in a single Docker container."
 authors = ["Erik Oosterop <erik.oosterop.khesw@aleeas.com>"]
 license = "MIT"
diff --git a/src/mimosa/dateswithoutdata.py b/src/mimosa/dateswithoutdata.py
index b8f5a33..9a733f5 100644
--- a/src/mimosa/dateswithoutdata.py
+++ b/src/mimosa/dateswithoutdata.py
@@ -5,13 +5,15 @@
 
 import datetime
 import os
-from datetime import date  # F401
+from datetime import date, timedelta  # F401
 
 import duckdb
 from dotenv import find_dotenv, load_dotenv
 
 import mimosa.utilities as tern
 
+DT_BASE = datetime.date(1900, 1, 1)
+
 _ = load_dotenv(find_dotenv())
 
 
@@ -24,7 +26,7 @@ def date_to_integer(dt_time):
     Returns:
         int: The integer representation of the input date.
     """
-    return 10000 * dt_time.year + 100 * dt_time.month + dt_time.day
+    return (dt_time - DT_BASE).days
 
 
 def integer_to_date(integer_value):
@@ -36,9 +38,7 @@ def integer_to_date(integer_value):
     Returns:
     datetime.date: The date corresponding to the integer value.
     """
-    year, remainder = divmod(integer_value, 10000)
-    month, day = divmod(remainder, 100)
-    return datetime.date(year, month, day)
+    return DT_BASE + timedelta(days=integer_value)
 
 
 def get_existing_dates_as_integer(start_dt=date(2018, 1, 1), end_dt=None):