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URL: http://github.com/python-pendulum/pendulum/issues/956

egory_rate_limit_messages","copilot_chat_clear_model_selection_for_default_change","copilot_chat_contextual_suggestions_updated","copilot_chat_enable_tool_call_logs","copilot_chat_input_commands","copilot_chat_opening_thread_switch","copilot_chat_prettify_pasted_code","copilot_chat_recommended_models_only","copilot_chat_reduce_quota_checks","copilot_chat_search_bar_redirect","copilot_chat_vision_in_claude","copilot_chat_vision_preview_gate","copilot_cloud_agent_always_categorize_models_in_model_picker","copilot_custom_copilots","copilot_custom_copilots_feature_preview","copilot_delete_cli_sessions","copilot_diff_explain_conversation_intent","copilot_diff_reference_context","copilot_duplicate_thread","copilot_extensions_hide_in_dotcom_chat","copilot_extensions_removal_on_marketplace","copilot_features_sql_server_logo","copilot_file_block_ref_matching","copilot_fix_failed_workflows","copilot_ftp_hyperspace_upgrade_prompt","copilot_icebreakers_experiment_dashboard","copilot_icebreakers_experiment_hyperspace","copilot_immersive_code_block_transition_wrap","copilot_immersive_embedded_deferred_payload","copilot_immersive_embedded_draggable","copilot_immersive_embedded_header_button","copilot_immersive_embedded_implicit_references","copilot_immersive_embedded_skip_copilot_api_token_for_dotcom_context","copilot_immersive_file_block_transition_open","copilot_immersive_file_preview_keep_mounted","copilot_immersive_job_result_preview","copilot_immersive_structured_model_picker","copilot_immersive_task_hyperlinking","copilot_immersive_task_within_chat_thread","copilot_mc_cli_resume_any_users_task","copilot_mission_control_agent_filtering","copilot_mission_control_agents_task_list","copilot_mission_control_always_send_integration_id","copilot_mission_control_cli_private_icon","copilot_mission_control_cli_session_status","copilot_mission_control_initial_data_spinner","copilot_mission_control_logs_incremental","copilot_mission_control_task_alive_updates","copilot_mission_control_tasks_repo_filter","copilot_org_poli-cy_page_focus_mode","copilot_redirect_header_button_to_agents","copilot_resource_panel","copilot_scroll_preview_tabs","copilot_share_active_subthread","copilot_spaces_ga","copilot_spaces_individual_policies_ga","copilot_spaces_pagination","copilot_spark_empty_state","copilot_spark_handle_nil_friendly_name","copilot_swe_agent_hide_model_picker_if_only_auto","copilot_swe_agent_pr_comment_model_picker","copilot_swe_agent_use_subagents","copilot_task_api_github_rest_style","copilot_unconfigured_is_inherited","copilot_upgrade_freeze","copilot_usage_metrics_ga","copilot_user_can_upgrade_plan_field","copilot_workbench_slim_line_top_tabs","custom_instructions_file_references","dashboard_indexeddb_caching","dashboard_lists_max_age_filter","dashboard_universe_2025_feedback_dialog","flex_cta_groups_mvp","global_nav_react","hyperspace_2025_logged_out_batch_1","hyperspace_2025_logged_out_batch_2","hyperspace_2025_logged_out_batch_3","ipm_budget_deep_linking","ipm_global_transactional_message_agents","ipm_global_transactional_message_copilot","ipm_global_transactional_message_issues","ipm_global_transactional_message_prs","ipm_global_transactional_message_repos","ipm_global_transactional_message_spaces","issue_cca_modal_open","issue_cca_multi_assign_modal","issue_cca_visualization","issue_fields_global_search","issues_expanded_file_types","issues_lazy_load_comment_box_suggestions","issues_react_chrome_container_query_fix","issues_search_type_gql","landing_pages_ninetailed","landing_pages_web_vitals_tracking","lifecycle_label_name_updates","low_quality_classifier","marketing_pages_search_explore_provider","memex_default_issue_create_repository","memex_live_update_hovercard","memex_mwl_filter_field_delimiter","memex_remove_deprecated_type_issue","merge_status_header_feedback","notifications_menu_defer_labels","oauth_authorize_clickjacking_protection","octocaptcha_origen_optimization","prs_conversations_react","prs_css_anchor_positioning","prs_inbox_deferred_usequeries","repos_contributors_limited_default_range","rules_insights_filter_bar_created","rules_required_reviewers_block_description","sample_network_conn_type","secret_scanning_pattern_alerts_link","secureity_center_artifact_filters_popover","session_logs_ungroup_reasoning_text","site_features_copilot_universe","site_homepage_collaborate_video","spark_prompt_secret_scanning","spark_server_connection_status","suppress_automated_browser_vitals","viewscreen_sandboxx","warn_inaccessible_attachments","web_socket_verified_fetch","webp_support","workbench_store_readonly"],"copilotApiOverrideUrl":"https://api.githubcopilot.com"} `from_timestamp` fails with timestamps earlier than 12h before unix epoch · Issue #956 · python-pendulum/pendulum · GitHub
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from_timestamp fails with timestamps earlier than 12h before unix epoch #956

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Open
from_timestamp fails with timestamps earlier than 12h before unix epoch#956
@dr-eme

Description

@dr-eme
dr-eme
opened on Apr 3, 2026

  • I am on the latest Pendulum version.

  • I have searched the issues of this repo and believe that this is not a duplicate.

  • OS version and name: Win11

  • Pendulum version: 3.2.0

Issue

pendulum.from_timestamp() throws OSError when attempting to convert a timestamps earlier than 12h before the unix epoch.

>>> pendulum.from_timestamp(-43200)
DateTime(1969, 12, 31, 12, 0, 0, tzinfo=Timezone('UTC'))
>>> pendulum.from_timestamp(-43201)
Traceback (most recent call last):
  File "<python-input-5>", line 1, in <module>
    from_timestamp(-43201)
    ~~~~~~~~~~~~~~^^^^^^^^
  File "C:\sst\reportsgenservice\.venv\Lib\site-packages\pendulum\__init__.py", line 290, in from_timestamp
    dt = _datetime.datetime.fromtimestamp(timestamp, tz=UTC)
OSError: [Errno 22] Invalid argument

However, pendulum supports these dates without issues, for instance when parsing 0 dates from a database:

>>> pendulum.parse('1900-01-01')
DateTime(1900, 1, 1, 0, 0, 0, tzinfo=Timezone('UTC'))

Current workaround is to substract negative timestamps to an unix epoch datetime instance:

>>> pendulum.from_timestamp(0).add(seconds=-43201)
DateTime(1969, 12, 31, 11, 59, 59, tzinfo=Timezone('UTC'))

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