Yahoo Calendar CLI: Manage Events

How do you use a Yahoo Calendar CLI from terminal?

Connect Yahoo once, then use nylas calendar events list, nylas calendar events create, and nylas calendar availability find. This gives you a Yahoo Calendar CLI workflow without CalDAV client code, app-specific passwords, or manual iCalendar parsing.

CalDAV is the only direct programmatic path into Yahoo Calendar.

Yahoo never shipped a public REST API for Calendar. The supported integration path has been CalDAV (defined in RFC 4791) for over a decade, served from caldav.calendar.yahoo.com. CalDAV works, but every consumer has to handle the same setup tax: generate an app-specific password in Yahoo Account Security, locate the right server URL, then wire up a CalDAV client library and parse iCalendar (RFC 5545) responses. Most teams give up before the first event syncs.

Nylas CLI connects to Yahoo Calendar through the Nylas platform. You authenticate once with OAuth, and every calendar command works the same way it does for Google or Outlook.

1. Install

Installing Nylas CLI takes under 2 minutes on macOS, Linux, or Windows. Run brew install nylas/nylas-cli/nylas (other methods). Yahoo doesn't require any special setup -- no CalDAV server URLs or app passwords needed when going through Nylas. The binary is roughly 25 MB and auto-detects your system architecture during install.

2. Authenticate your Yahoo account

Nylas CLI authenticates Yahoo accounts through OAuth 2.0, which eliminates the need for app-specific passwords that Yahoo requires for direct CalDAV access. Create an application in the Nylas dashboard, connect your Yahoo account there, then configure the CLI with your API key. The entire auth flow completes in under 60 seconds.

The nylas auth config command stores your API key locally so subsequent commands authenticate automatically. Run nylas auth whoami after configuration to confirm the connection is active.

nylas auth config
# Paste your API key when prompted

# Verify the connection
nylas auth whoami

Verify the connection by listing your calendars:

nylas calendar list

3. List Yahoo Calendar events

Listing Yahoo Calendar events with Nylas CLI returns all events within a configurable time window, defaulting to the next 7 days. Each result includes the event title, time range, location, participant count, and a unique event ID you can use for updates or deletions. The --json flag outputs structured data suitable for piping into jq or other scripting tools.

Yahoo Calendar stores events using the iCalendar format defined in RFC 5545. Nylas normalizes these into a consistent JSON structure, so you don't need to parse raw iCalendar VEVENT components yourself. The commands here work on any Yahoo account type, including legacy AT&T and Verizon Yahoo-powered accounts.

# Next 7 days (default)
nylas calendar events list

# Next 30 days
nylas calendar events list --days 30

# JSON output for scripting
nylas calendar events list --json

# Filter by calendar
nylas calendar events list --calendar cal_abc123

Example output

$ nylas calendar events list --days 7

Team Standup
  When: Mon, Mar 30, 2026, 9:00 AM - 9:30 AM
  Location: Zoom
  Guests: 4 participant(s)
  ID: event_y7k2m

Dentist Appointment
  When: Wed, Apr 1, 2026, 2:00 PM - 3:00 PM
  ID: event_p3x8n

Found 5 event(s)

4. Create events

Creating Yahoo Calendar events from the command line requires a title, start time, and end time at minimum. Nylas CLI translates these flags into the iCalendar VEVENT format that Yahoo's CalDAV backend expects, handling the conversion automatically. You can add participants, a location, and all-day flags in a single command.

Direct CalDAV event creation requires constructing an HTTP PUT request with a well-formed iCalendar payload -- typically 20-30 lines of boilerplate for a single event. The CLI condenses that into one command with flags. Each created event returns its unique event ID for later modification.

# Basic event
nylas calendar events create \
  --title "Sprint Planning" \
  --start "2026-04-01 10:00" \
  --end "2026-04-01 11:00"

# With location and participants
nylas calendar events create \
  --title "Product Review" \
  --start "2026-04-02 14:00" \
  --end "2026-04-02 15:00" \
  --location "Conference Room B" \
  --participant alice@company.com \
  --participant bob@company.com

# All-day event
nylas calendar events create \
  --title "Company Holiday" \
  --start "2026-04-10" \
  --all-day

5. Update and delete events

Updating and deleting Yahoo Calendar events uses the event ID returned during creation or listing. Nylas CLI sends the corresponding CalDAV PROPPATCH or DELETE request to Yahoo's server, so you don't need to construct XML payloads manually. Updates are partial -- you only pass the fields you want to change, and the rest stay intact.

Yahoo's CalDAV endpoint at caldav.calendar.yahoo.com processes updates synchronously. The CLI confirms the operation completed before returning, typically within 1-2 seconds per request.

# Update an event title and time
nylas calendar events update event_y7k2m \
  --title "Team Standup (moved)" \
  --start "2026-03-30 10:00" \
  --end "2026-03-30 10:30"

# Delete an event
nylas calendar events delete event_p3x8n

6. Check availability and find time

Checking availability on Yahoo Calendar through CalDAV is not natively supported -- Yahoo's CalDAV server does not implement the VFREEBUSY component from RFC 4791. Nylas CLI fills that gap by computing free/busy data server-side across any connected provider, including Yahoo. You can check your own schedule or find mutual openings across 2 or more participants in a single command.

The availability engine evaluates all-day events, recurring series, and multi-timezone participants. Specify a duration in minutes and the CLI returns available slots sorted by earliest start time.

# Check your own availability
nylas calendar availability check

# Find a time that works for everyone
nylas calendar availability find \
  --participants alice@company.com,bob@company.com \
  --duration 30

# Check availability for a specific day
nylas calendar availability check \
  --start "2026-04-05 00:00" \
  --end "2026-04-06 00:00"

7. JSON output for scripting

Every Nylas CLI calendar command supports the --json flag, which outputs structured JSON instead of the default human-readable table. This makes it straightforward to pipe Yahoo Calendar data into jq, export events to CSV, or feed them into shell scripts and cron jobs. The JSON schema includes all event fields: title, start/end timestamps, location, participants, recurrence rules, and the event ID.

Raw CalDAV responses from Yahoo come back as iCalendar text, which requires a dedicated parser to extract structured data. The --json flag skips that step entirely. The examples here use jq version 1.6+, which ships with most Linux distributions and is available via Homebrew on macOS.

# Get all events as JSON
nylas calendar events list --json

# Extract just titles and times with jq
nylas calendar events list --json | jq '.[] | {title: .title, start: .when.start_time}'

# Count events per day
nylas calendar events list --days 14 --json | jq 'group_by(.when.start_time[:10]) | map({date: .[0].when.start_time[:10], count: length})'

# Export to CSV
nylas calendar events list --json | jq -r '.[] | [.title, .when.start_time, .when.end_time] | @csv' > events.csv

8. Yahoo Calendar access: Nylas CLI vs CalDAV

Yahoo Calendar's CalDAV interface requires manual server URL configuration, an app-specific password generated from Yahoo Account Security, and a CalDAV client library that can parse iCalendar responses. Nylas CLI replaces that entire stack with OAuth authentication and a single command interface. Setup drops from 15-30 minutes with CalDAV to under 2 minutes with the CLI, and availability features that CalDAV does not support at all become available immediately.

9. Yahoo-specific notes

Yahoo Calendar has several platform-specific behaviors that affect CLI-based calendar management. These range from mobile sync latency differences to legacy account types inherited from AT&T and Verizon partnerships, and recurring event handling tied to the iCalendar RRULE specification. Understanding these details helps avoid silent failures when automating Yahoo Calendar workflows.

Yahoo Calendar mobile sync

Events created through Nylas CLI appear on Yahoo Calendar's mobile app within minutes. Yahoo uses push sync for its own apps, so changes propagate faster than CalDAV polling intervals (which default to 15-minute cycles on most clients).

Yahoo Groups events

If you belong to Yahoo Groups that create calendar events, those events show up when you run nylas calendar events list. You can read and export them. Editing group events depends on the group's permission settings. Events you didn't create may be read-only.

Legacy AT&T and Verizon Yahoo accounts

Yahoo accounts are not always plain yahoo.com identities. In practice, many users still sign in through older AT&T, Verizon, Rogers, or other migrated Yahoo-powered accounts. Those edge cases matter because the account branding can differ from the backend that actually stores the calendar. This is one of the main reasons Yahoo calendar automation feels messier than Google or Outlook even before you touch CalDAV.

Account security and recovery friction

Yahoo also has a reputation for aggressive sign-in prompts, recovery checks, and account-security interruptions after long periods of inactivity. That makes calendar automations on Yahoo feel more consumer-account-oriented than enterprise-account-oriented. If a Yahoo workflow suddenly breaks, the root cause is often account security posture or stale recovery settings, not the event payload.

Recurring events

Yahoo Calendar supports recurring events through the iCalendar RRULE spec. When you list events with Nylas CLI, each occurrence appears as a separate entry. To modify a single occurrence without changing the series, use the specific event ID for that instance.

Timezone handling

Yahoo Calendar stores events in the timezone you specify at creation time. If you don't specify one, Nylas CLI uses your system timezone. According to the IANA Time Zone Database, Yahoo supports all standard timezone identifiers. Use --timezone to override:

nylas calendar events create \
  --title "Cross-timezone sync" \
  --start "2026-04-05 09:00" \
  --end "2026-04-05 09:30" \
  --timezone America/New_York

Why Yahoo is different from iCloud

Yahoo and iCloud both lack a polished public calendar API story, but they are not the same operationally. iCloud users usually care about Apple ecosystem sync and shared family calendars. Yahoo users more often deal with legacy webmail identities, consumer account recovery, and CalDAV compatibility. Treating those pages as interchangeable is exactly what creates duplicate-content risk, so the workflows here stay grounded in Yahoo-specific account behavior rather than just generic CRUD commands.

Next steps

• Manage calendar from the terminal -- full calendar guide with DST detection, working hours, and AI scheduling
• Yahoo Mail CLI: Read Emails from Terminal -- read and search Yahoo Mail with the same CLI
• Send email from the command line -- send through Yahoo or any other provider
• Give AI agents email and calendar access via MCP -- let Claude or Cursor manage your Yahoo Calendar
• Full command reference -- every calendar flag and subcommand