diff --git a/4dev/tests/Combined/CoreLibsCombinedDateTimeTest.php b/4dev/tests/Combined/CoreLibsCombinedDateTimeTest.php
index 2dd24809..ddc03cad 100644
--- a/4dev/tests/Combined/CoreLibsCombinedDateTimeTest.php
+++ b/4dev/tests/Combined/CoreLibsCombinedDateTimeTest.php
@@ -458,6 +458,47 @@ final class CoreLibsCombinedDateTimeTest extends TestCase
 		];
 	}
 
+	/**
+	 * Undocumented function
+	 *
+	 * @return array
+	 */
+	public function dateRangeHasWeekendProvider(): array
+	{
+		return [
+			'no weekend' => [
+				'2023-07-03',
+				'2023-07-04',
+				false
+			],
+			'start weekend sat' => [
+				'2023-07-01',
+				'2023-07-04',
+				true
+			],
+			'start weekend sun' => [
+				'2023-07-02',
+				'2023-07-04',
+				true
+			],
+			'end weekend sat' => [
+				'2023-07-03',
+				'2023-07-08',
+				true
+			],
+			'end weekend sun' => [
+				'2023-07-03',
+				'2023-07-09',
+				true
+			],
+			'long period > 6 days' => [
+				'2023-07-03',
+				'2023-07-27',
+				true
+			]
+		];
+	}
+
 	/**
 	 * date string convert test
 	 *
@@ -780,6 +821,29 @@ final class CoreLibsCombinedDateTimeTest extends TestCase
 			$output
 		);
 	}
+
+	/**
+	 * Undocumented function
+	 *
+	 * @covers ::dateRangeHasWeekend
+	 * @dataProvider dateRangeHasWeekendProvider
+	 * @testdox dateRangeHasWeekend $start_date and $end_date are expected weekend $expected [$_dataName]
+	 *
+	 * @param  string $start_date
+	 * @param  string $end_date
+	 * @param  bool   $expected
+	 * @return void
+	 */
+	public function testDateRangeHasWeekend(
+		string $start_date,
+		string $end_date,
+		bool $expected
+	): void {
+		$this->assertEquals(
+			$expected,
+			\CoreLibs\Combined\DateTime::dateRangeHasWeekend($start_date, $end_date)
+		);
+	}
 }
 
 // __END__
diff --git a/www/admin/class_test.datetime.php b/www/admin/class_test.datetime.php
index 56c8854d..a20fb41c 100644
--- a/www/admin/class_test.datetime.php
+++ b/www/admin/class_test.datetime.php
@@ -143,6 +143,26 @@ print "DATE-dow[$date];invalid: " . DateTime::setWeekdayNameFromDate($date) . "<
 print "DATE-dow[$date],long;invalid: " . DateTime::setWeekdayNameFromDate($date, true) . "<br>";
 print "DOW-date[$date];invalid: " . DateTime::setWeekdayNumberFromDate($date) . "<br>";
 
+// check date range includes a weekend
+// does not:
+$start_date = '2023-07-03';
+$end_date = '2023-07-05';
+print "Has Weekend: " . $start_date . " ~ " . $end_date . ": "
+	. Dgs::prBl(DateTime::dateRangeHasWeekend($start_date, $end_date)) . "<br>";
+$start_date = '2023-07-03';
+$end_date = '2023-07-10';
+print "Has Weekend: " . $start_date . " ~ " . $end_date . ": "
+	. Dgs::prBl(DateTime::dateRangeHasWeekend($start_date, $end_date)) . "<br>";
+$start_date = '2023-07-03';
+$end_date = '2023-07-31';
+print "Has Weekend: " . $start_date . " ~ " . $end_date . ": "
+	. Dgs::prBl(DateTime::dateRangeHasWeekend($start_date, $end_date)) . "<br>";
+$start_date = '2023-07-01';
+$end_date = '2023-07-03';
+print "Has Weekend: " . $start_date . " ~ " . $end_date . ": "
+	. Dgs::prBl(DateTime::dateRangeHasWeekend($start_date, $end_date)) . "<br>";
+
+
 print "</body></html>";
 
 // __END__
diff --git a/www/lib/CoreLibs/Combined/DateTime.php b/www/lib/CoreLibs/Combined/DateTime.php
index c1f16147..27917886 100644
--- a/www/lib/CoreLibs/Combined/DateTime.php
+++ b/www/lib/CoreLibs/Combined/DateTime.php
@@ -452,6 +452,31 @@ class DateTime
 			return $days;
 		}
 	}
+
+	/**
+	 * check if a weekend day (sat/sun) is in the given date range
+	 * Can have time too, but is not needed
+	 *
+	 * @param  string $start_date Y-m-d
+	 * @param  string $end_date   Y-m-d
+	 * @return bool               True for has weekend, False for has not
+	 */
+	public static function dateRangeHasWeekend(
+		string $start_date,
+		string $end_date,
+	): bool {
+		$dd_start = new \DateTime($start_date);
+		$dd_end = new \DateTime($end_date);
+		if (
+			// starts with a weekend
+			$dd_start->format('N') >= 6 ||
+			// start day plus diff will be 6 and so fall into a weekend
+			((int)$dd_start->format('w') + $dd_start->diff($dd_end)->days) >= 6
+		) {
+			return true;
+		}
+		return false;
+	}
 }
 
 // __END__