How to use the Posting Time Team Converter
- Set the slot. Enter the date, the time and the zone the post is scheduled in. This is the one moment everything else is converted from.
- Add your teammates. Give each person a name, a time zone and their working hours. You can add up to 10. Pick a zone from the suggestions or type any IANA zone name.
- Read the flags. Each row shows that person's local time and date with a flag: in hours, outside hours or asleep. A shared window appears if everyone is working at the same time.
- Share it. Copy the one-line message for chat, or download an .ics file so the slot lands in every calendar at the right UTC moment.
How the team converter works
What it checks
The slot is turned into one UTC moment using your browser's built-in Intl time zone data, which follows the IANA time zone database. Each teammate's row is that same moment shown in their zone, so there is no rounding between zones and half-hour or 45-minute offsets, such as India or Nepal, are exact.
Each row is flagged by local clock time: in hours when it falls inside the working hours you entered, asleep from 22:00 to 07:00, and outside hours for everything else. The shared window is found by stepping through the 24 hours around the slot in 15 minute steps and keeping the times when every teammate is in hours at once.
Rules and sources
Daylight saving is detected by comparing the zone's offset on each of the 7 days before and after the slot. A change in the offset is reported with the before and after values, so the warning does not depend on a hard-coded list of dates.
The calendar file follows the iCalendar format in RFC 5545 from the IETF: UTC date-times, escaped text, CRLF line endings and lines folded at 75 octets. The conversions are tested across the 25 October and 1 November 2026 clock changes.
Limitations
The asleep band and the 7 day window are fixed. Working hours must start and end on the same day. The tool does not know weekends, holidays or leave, and zone abbreviations such as CET depend on what your browser provides, so a zone without a common abbreviation is shown as a UTC offset. Everything runs in your browser and nothing you enter is sent anywhere.
Frequently asked questions
How is this different from the Timezone Posting Planner?
The Timezone Posting Planner helps you choose when to publish for audiences in different regions. This tool starts from a time you already picked and answers a team question: what time is that for each of us, and does anyone need to be awake for it? It converts one slot for up to 10 teammates and flags their working hours.
What counts as asleep?
Any local time from 22:00 up to 07:00. It is a fixed rule of thumb, not a setting per person. If a teammate's working hours cover part of that band, such as a night shift that starts at 22:00, their working hours win and the row shows in hours.
Why does the tool warn me about daylight saving?
Clocks change on different dates in different places. In 2026 the EU ends summer time on 25 October and the US on 1 November, so for one week the gap between Madrid and New York is 5 hours instead of the usual 6. If the date you choose is within 7 days of a change in any zone, a warning names the zone and the old and new offset.
What happens if the slot falls in the hour that repeats or is skipped?
When clocks go back, one local hour happens twice, and the tool uses the first one. When clocks go forward, an hour does not exist, and the tool uses the first valid moment after the gap. Check the converted times, or pick a slot away from 01:00 to 03:00 on change days.
Is the calendar file in my time zone or UTC?
The .ics file stores the start and end in UTC, which every calendar app converts to the viewer's own zone. That means the event is correct for each teammate even if they are in different zones and even across a clock change.
Does it check my team's weekdays or holidays?
No. It looks at the clock time only. A slot on a Saturday still shows in hours if it falls inside someone's working hours, so look at the weekday shown on each row and check public holidays yourself.