10 Time Zone Converter Tools to Schedule Meetings Worldwide (2025 Guide)

Picking a time across continents shouldn't feel like air-traffic control. Converters are great at math; teams need clarity, context, and shareability. Here's a practical guide to 10 tools what they do well, where they wobble, and when to reach for each. Spoiler: for recurring work with the same people, a shared overlap board beats a one-off converter every time.

Comparison at a glance

Tool	Best For	Why Teams Like It	Watch-Outs	Try This
Timezoners	Recurring collaboration with the same teammates across US/EU/APAC	Live board of people + working hours; instant "green zone" overlap; sharable no-login links	Not a full calendar (by design) still send invites via Google/Outlook	Create a board, mark no-meeting blocks, and pin the link in Slack. Update cities when people travel.
timeanddate Meeting Planner	Quick multi-city windows (prospects, vendors, webinars)	Huge city database; reliable DST rules; clear red/green blocks	No team persistence; must rebuild cities each time	Propose two UTC-anchored slots ~12h apart so one is humane for all.
WorldTimeBuddy	Fast "what time is it there?" comparisons	Familiar timeline; drag to select windows	City-centric, not team-centric; recurring meetings still manual	Save a shortlist of critical cities; use overlap board for ongoing cadence.
SavvyTime	Sales/support with external guests	Simple overlap view; links/screenshots easy to share	No teammate persistence; limited working-hour logic	Save a default window template (e.g., "US morning / EU afternoon") for reuse.
Every Time Zone	Solo sanity checks	Minimalist slider; frictionless	Not for groups; DST quirks easy to miss	Use for quick confirmation, then plan in a proper overlap tool.
Google Calendar TZ Features	Preventing mistakes in invites	Dual time-zones, world clock sidebar, per-event TZ	No multi-teammate overlap grid; messy for external orgs	Decide slot in an overlap tool, then set event TZ to recipient's city + paste UTC note.
Outlook Scheduling Assistant / Teams	Internal meetings in Microsoft shops	Built-in availability + timezone awareness	Weak for cross-org or mixed toolchains; still need neutral overlap	Use internally, but keep a neutral overlap board for external cadence.
The Time Zone Converter	Quick one-off conversions	Simple, uncluttered, copy-paste friendly	No teams; no working hours; pure math	Convert to UTC first, then share both UTC + local times.
Dateful Converter	Clean, copy-ready outputs	Human-readable strings; easy for docs/email	Same as other basics no persistence or overlap logic	Keep snippets of your top cities for faster repeats.
Timezone.io	Awareness of where teammates are	Person-centric directory; good for onboarding	Awareness ≠ scheduling; no overlap selection	Link from your "How we work" doc; pair with a Timezoners board.

A simple playbook that actually works

Pick the slot where overlap is obvious. Use Timezoners to see a living green zone for the people involved not just cities.
Anchor in UTC. Share your proposal like this: "3-4pm UTC (NY 11–12am, London 4–5pm)." Fewer DST surprises.
Send from your calendar. Set the event's timezone to the recipient's location and paste the UTC note in the description.
Write it down once. Pin your overlap board in Slack and link it in your working agreement so newcomers inherit your scheduling rules.

FAQs

Q: Do I still need a converter if my calendar handles time zones?
Yes your calendar prevents broken invites, but it doesn't make the overlap obvious. Decide the time in a planner, then send the invite.
Q: What's the least painful US–EU window?
Aim for late-morning ET / late-afternoon UK. When guessing, anchor in UTC and offer two options to keep things humane.
Q: How do we stay fair across US–EU–APAC?
Rotate across three UTC anchors on a published schedule so the burden is shared predictably.