vøiddo
tool · time / scheduling

tzdiff.

compare timezones at a glance. for humans, not crontabs.

show what time it is now (or at a specific time) across multiple timezones. dst-aware. iana + abbreviations. mit-licensed, no api calls.

npm i -g @v0idd0/tzdiff
github → npm mit · free forever
tzdiff icon
what it does

stop asking “wait, is that 3pm their time?” again.

four jobs. all in your terminal. no api call, no internet round-trip — just a plain tool that does what it says.

compare cities

$ tzdiff NYC LON TYO
NYC 09:00
LON 14:00
TYO 22:00

natural language

$ tzdiff "monday 9am NYC"
your local: mon 16:00
tokyo: tue 06:00

overlap window

$ tzdiff NYC TYO --working-hours
no overlap during normal hours
nearest: NYC 19-22 = TYO 08-11

full day

$ tzdiff NYC LON --day
00:00 NYC = 05:00 LON
06:00 NYC = 11:00 LON
...(every hour)
install

three ways. all painless.

npm

$ npm i -g @v0idd0/tzdiff

node 14+ on linux / macos / windows. updates with npm update -g.

github releases

$ curl -L github.com/voidd0/tzdiff/releases/latest

single static binary. zero runtime needed. all releases →

git clone

$ git clone github.com/voidd0/tzdiff

read the source, send a pr, fork it. mit licence, no cla. repo →

why we built it

scheduling a call across 3 timezones shouldn’t require opening time.is. tzdiff prints the table in 0.04s — and it’s dst-aware, so it doesn’t lie when clocks change.

no telemetry. no signup. no api round-trip — uses the iana tz database vendored in the binary. mit forever, even if vøiddo dies tomorrow.

star on github → all tools

power user?

use this daily? tools.voiddo Pro · $9 one-time

supports 66 free tools · Pro license via Paddle · one flat price, no subscription

comparing tools? tzdiff vs WorldTimeServer.com →