Spacetime is described as 'Bring your remote team closer' and is an app in the Office & Productivity category. There are five alternatives to Spacetime for Online / Web-based, iPhone, iPad and Slack. The best alternative is Every Time Zone, which is free. Other great apps like Spacetime are Channel Time (Free, Open Source), Timezone.io (Free), Time&Time (Paid) and Dilims (Paid).
Use /time to convert times Don't ask if that the time is in your time zone or your teammate's time zone. Start a message with /time and Channel Time will automatically parse your message to convert the time for everybody in the room.
Modern global teams have awesome people spread across multiple timezones. Lots of teams have digital nomads changing locations faster than we can keep up with. Often it gets tricky to remember what time it is where your teammates are. Enter Timezone.io.
Dilims lets you display different time slots in different time zones to quickly find other peoples local times. Add your co-workers working hours and quickly find overlapping times. - Add multiple time slots for each time zone.