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Pick a zone, a local wall time, a DST disambiguation policy and a broadcast-day cutover. The slot, the week key, the UTC instant, the daypart and the broadcast day are computed in your browser, and a gap or fold is reported rather than silently resolved.
Canonical axis
168 slots, UTC
Slot zero
Monday 00:00 UTC
Runs in
Your browser
Start from a known edge case
IANA time zone
Local wall time
DST disambiguation
Broadcast-day cutover
06:00 local
00:0006:0012:00
Local wall time: 2026-03-08 02:30 in America/New_York
Canonical resolution
Gap · nonexistentSlot
151 · Sun 07:00 UTC
Week key
2026-W10-S151
UTC instant
2026-03-08T07:30:00.000Z
Offset
-4h
Daypart
overnight
Broadcast day
2026-03-07 (06:00 cutover, 23h)
The 168 axis · hour of week, UTC
SLOT 151Mon
Tue
Wed
Thu
Fri
Sat
Sun
0006121823
A gap or fold is reported, never silently resolved. Local time resolves to UTC first, and the slot is read off the UTC axis.