Free tool · Messaging
SMS send-window planner
Pick a destination and see when you can send there, converted to your time zone and with public holidays marked.
No verified sending-hour rule for this destination yet.
We list the rules we could verify. A topic with no verified rule is left out, not guessed. This is reference information, not legal advice; check the regulator link and the last-verified date.
- Destination
- You
- Difference
This window runs overnight: sending starts on each date in the plan and ends the next day, destination time.
| Date (destination) | Destination time | Your time ({zone}) | UTC | Note |
|---|
The public-holiday calendar could not be loaded, so holidays are not marked in this plan. Reload the page, or verify locally before you schedule.
Holiday calendars are community-maintained and can miss regional or newly announced holidays: verify locally before you schedule.
How this works and its limits
Runs in your browser: what you enter stays on your device and is never uploaded.
Time zones and daylight-saving rules come from your browser. Public holidays are a calendar computed when the site is published, so the planner works without sending anything to a server.
Country sending-hour rules appear once they have been verified against their source (see SMS rules by country); until then the planner shows local time and holidays only. Holiday data is community-maintained, so verify locally before you schedule a campaign.
Data sources and licences
Operator names, brands and codes shown here are public reference data compiled from national regulators and other public sources. Their appearance does not indicate any partnership, endorsement, agreement or connectivity between unicomam.com and the named operators. All trademarks belong to their owners. Data is provided “as is” with no warranty; verify against the official source before relying on it for routing, billing or compliance decisions.
Regulatory information is for reference only and is not legal advice; check the regulator link and the “last verified” date.
Time zone rules: IANA Time Zone Database (public domain), as provided by your browser, and the zone coordinates in zone1970.tab. Public-holiday data derived from python-holidays (opens in a new tab), MIT License, Copyright (c) Vacanza Team and individual contributors. Holiday data is community-maintained; verify locally before scheduling.
Why sending hours matter for A2P SMS
Sending hours decide when a business message reaches people. Promotional messages that arrive at night, early in the morning or on a public holiday annoy recipients, lead to complaints and opt-outs and, in some countries, break the rules. Many countries limit when marketing messages may be sent, and operators often apply quiet hours of their own.
The rules usually separate traffic types. Verification codes and transactional messages, such as delivery or account alerts, are expected at any time because the recipient asked for them. Promotional messages are the ones sending-hour limits target, sometimes with different hours at weekends and a ban on public holidays. Check each destination’s rules before you rely on an exemption.
Planning across countries means converting each destination’s allowed hours into your own time zone. Daylight-saving time complicates this: the offset between you and a destination changes whenever either side moves its clocks, and the two sides rarely change on the same date. A campaign scheduled with a fixed offset can drift by an hour for part of the year, which is enough to push messages outside the allowed window.
Large countries can span several time zones, so a nationwide campaign either sends in waves, zone by zone, or keeps to the hours that are allowed everywhere. Public holidays are another trap: a working day for you may be a holiday at the destination, and regional holidays may apply in only part of a country.
This planner turns the hours you choose, in the destination’s local time, into your time and UTC for each day, marks public holidays from a community-maintained calendar and lets you download the plan. Verified country rules, each with its source and the date it was last checked, appear in the planner as they are confirmed. Holiday calendars can miss regional or newly announced holidays, so verify locally before a large campaign.