Format timestamp string differently on windows

The minus (-) modifiers are not supported

CHANGELOG.md

@@ -5,6 +5,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 Version number is based on [Semver](https://semver.org/).
 Note that major version zero (0.y.z) is for initial development and anything may change at any time.
 
+## [0.8.1] 2024-11-28
+
+## Fixed
+
+- Windows-specific error with format string for timestamps
+
 ## [0.8.0] 2024-11-19
 
 ## Added

canvascli/main.py

@@ -4,6 +4,7 @@
 import getpass
 import json
 import os
+import platform
 import re
 from collections import defaultdict
 from datetime import datetime
@@ -770,7 +771,8 @@ def save_prepared_grades_to_file(self):
             writer.sheets['Sheet1'].write(0, 0, "Record Name:")
             writer.sheets['Sheet1'].write(0, 1, "Course Registrations")
             writer.sheets['Sheet1'].write(1, 0, "Exported On:")
-            writer.sheets['Sheet1'].write(1, 1, pd.Timestamp.now().strftime('%b %-d, %Y %-I:%-M %p'))
+            time_format = '%b %#d, %Y %#I:%#M %p' if platform.system() == 'Windows' else '%b %-d, %Y %-I:%-M %p'
+            writer.sheets['Sheet1'].write(1, 1, pd.Timestamp.now().strftime(time_format))
         click.secho(f'Grades saved to {excel_file_name}.', bold=True, fg='green')
         return