----.----
left
right
New event
start
duration
end
repeat

Anchor

Set which civil date corresponds to hex timestamp 0000.0000. Default: Jan 1, 2000.
0000.0000 = this date
Timezone
Day starts
▸ ✦ Set anchor from birthday
Enter your birth date — the anchor adjusts so your birthday = 0100 (day 256).
Birthday

Unit names

day (16⁰ = 1 civil day) is the anchor. Larger units go left (×16 each), smaller go right (÷16 each).

Datetime → Hex

Date
Time

Hex → Datetime

Backup / Restore

Export your settings and events as a JSON file. Paste it back to restore if your browser data gets wiped.

How it works

DDDD.TTTT — DDDD = hex day count from anchor. TTTT = fraction of day from day-start.

Anchor: The civil date you set as 0000.0000. With the birthday helper, your birth date becomes day 0100 (= 256).

Scale k: grid = 16k days, row = 16k−1, cell = 16k−2. Column-major order.