Binary clock settings

Seconds24-hourMode

Shortcuts: F fullscreen, C copy, S seconds, B mode, 1 12-hour, 2 24-hour

Binary Clock (Time in Binary)

View local time in binary using BCD or pure binary, with seconds, 12/24-hour mode, copy, and fullscreen.

How it works

This Binary Clock shows the current time from your device and renders it in binary in a way you can actually use. It is not a “learn binary” article and it is not a novelty widget that hides the useful parts. You pick how you want the bits expressed, then the page stays consistent: it updates cleanly, offers a copy-friendly snapshot, and supports fullscreen when you want a readable display at a distance.

The two viewing modes are for two different intents: BCD keeps the familiar clock digits and shows each decimal digit as four bits. Pure binary shows hours, minutes, and seconds as true binary numbers. Neither mode changes the underlying time. It only changes the representation.

If you want a standard display instead, use Digital Clock or Analog Clock. If you want elapsed time in a binary-style format, try the Binary Stopwatch . If you need time across locations, use World Clock or Time Zone Converter.

BCD + pureSeconds toggle12/24-hourCopy snapshotFullscreen

The fastest setup (no scrolling, no configuration rabbit holes)

1) Pick a mode: BCD (digits) or Pure (binary numbers). Press B to toggle.
2) Decide whether you want seconds. Press S to toggle.
3) Choose 24-hour or 12-hour. Press 2 for 24-hour, 1 for 12-hour.
4) Use F for fullscreen when you want a wall display.
5) Use C to copy a snapshot of the current moment.

What you are actually looking at

The large time line is your local time formatted in either 24h or 12h style. The grid beneath it is the binary representation. In BCD, you get one 4-bit column per digit. In pure mode, you get one bit column per field (hours, minutes, seconds).

The page updates aligned to the next whole-second boundary. Even if seconds are hidden, the page still ticks on second boundaries so the minute change happens cleanly.

Quick mode choice (pick based on intent)

Choose BCD when you want the bits to stay aligned to clock digits.
Choose Pure when you want the actual hour, minute, and second values as binary numbers.
Hide seconds for a calmer display. Show seconds for a “live” clock feel.
This uses your device clock. It is not a network-synced or atomic time source.

Practical tip: If you are going to share a screenshot or paste output into notes, turn seconds on for more precise snapshots, then use Copy.

What each option changes (and what it does not)

BCD mode: digit-by-digit binary that stays readable

BCD is built for the moment you want “binary time” while still thinking in normal clock digits. The time stays in the same format you already recognize (HH:MM:SS or HH:MM). The difference is that each digit becomes a 4-bit group, so the grid can be read as a compact mapping of digits to bits.

This makes BCD ideal for quick glances and for displays where you want to see which digit changed. When minutes roll from 09 to 10, you can tell it was a digit change, not a full-field binary rollover.

Pure binary mode: binary numbers for hours, minutes, seconds

Pure mode is for users who want the binary values of the fields themselves. Minutes are shown as a 6-bit number because minutes range from 0 to 59. Seconds are the same. Hours use 5 bits in 24-hour mode (0–23), and 4 bits in 12-hour mode (1–12). The grid is a direct binary value display rather than a digit mapping.

If you are validating an implementation, comparing to another encoded clock, or just want the cleanest “binary number” view, pure mode is the right choice.

Real scenarios with concrete examples

These examples mirror what people actually do on this page: toggle a mode, hide seconds for stability, switch to 12-hour time for display style, and copy a snapshot for notes. The numbers below are intentionally specific so you can verify the bit strings yourself.

Scenario 1: Debug a specific moment (24-hour + seconds on)

You want a binary snapshot of a visible time

Displayed time: 13:07:42 (24-hour, seconds on) BCD (each digit -> 4 bits): Digits: 1 3 0 7 4 2 Bits: 0001 0011 0000 0111 0100 0010 Pure binary (fields -> binary numbers): Hours 13 (5 bits): 01101 Minutes 7 (6 bits): 000111 Seconds 42 (6 bits): 101010

Scenario 2: Calm desk display (seconds off)

You want binary time without constant motion

Displayed time: 09:58 (24-hour, seconds off) BCD: Digits: 0 9 5 8 Bits: 0000 1001 0101 1000 Pure binary: Hours 9 (5 bits): 01001 Minutes 58 (6 bits): 111010

Scenario 3: 12-hour display for a wall clock (AM/PM suffix)

You want a familiar display style but still binary

Displayed time: 03:05 PM (12-hour, seconds off) Underlying local hour: 15:05 in 24-hour time BCD (12-hour uses hour digits '03'): Digits: 0 3 0 5 Bits: 0000 0011 0000 0101 Pure binary (12-hour hour value is 3, 4 bits): Hours 3 (4 bits): 0011 Minutes 5 (6 bits): 000101

Scenario 4: Copy a snapshot you can paste into notes

You want a compact record including ISO time

Example copy content (format may vary slightly by locale): 13:07:42 (America/Toronto) Friday, February 20, 2026 H:01101 M:000111 S:101010 ISO: 2026-02-20T18:07:42.123Z Tip: If you need a timestamped moment, keep seconds on and use Copy.

Fullscreen and shortcuts (what you will actually use)

Fullscreen is built for readability, not for hiding controls. You can still change mode, seconds, and 12/24-hour settings while in fullscreen. Keyboard shortcuts are designed to keep you moving without hunting for toggles.

F fullscreenC copyS secondsB mode1 12-hour2 24-hourEsc exit

Related tools (same idea, different representation)

If you like encoded time displays, these routes keep the intent but change the format.

Shortcuts: F C S B 1 2 Esc

Hexadecimal Clock →Binary Stopwatch →Morse Code Clock →Fibonacci Clock →Epoch / Unix Time Clock →UTC Clock →World Clock →Digital Clock →

Technical details (bit widths, time source, copy format)

What the grid represents, how fields are sized, and what Copy includes

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BCD mapping

In BCD mode, each decimal digit (0–9) is displayed as 4 bits. The grid shows one 4-bit column per digit in the displayed time. When seconds are off, only HH:MM digits are shown.

Pure binary field sizing

Minutes and seconds use 6 bits (0–59). Hours use 5 bits in 24-hour mode (0–23). In 12-hour mode, hours use 4 bits (1–12) and the AM/PM suffix is shown as text alongside the time.

Time source

The clock uses your device’s local time. The timezone label is read from the browser when available. This page does not convert between time zones and does not query a time server.

Copy output

Copy includes the formatted time, a timezone label, a date line, a mode-specific binary line, and an ISO timestamp. ISO is included as a UTC reference even if your display format is 12-hour.

Fullscreen behavior

Fullscreen uses the browser Fullscreen API on the clock card. If fullscreen is not available due to browser policies, the page continues to work normally. Exiting is always available via Esc or the Exit control.

Need time across locations? Use World Clock or Time Zone Converter.

Want a normal clock view? Use Digital Clock or Current Local Time.

Keyboard shortcuts

Click the clock card once, then use the keyboard to control the display. Shortcuts won’t trigger when your cursor is inside an input.

Key	Action
`F`	Toggle fullscreen
`C`	Copy a snapshot of the current time + binary
`S`	Toggle seconds on/off
`B`	Switch mode (BCD ↔ pure binary)
`1`	Switch to 12-hour time
`2`	Switch to 24-hour time
`Esc`	Exit fullscreen

Tip: if shortcuts do nothing, the clock card probably isn’t focused. Click the card, then try again.

Common scenarios

Use this page when you want a binary view of the current local time. Choose BCD for digit-by-digit readability, or pure mode for true binary number fields.

See the current time in binary (quick glance)

Open the page and immediately see your local time rendered as binary, with a readable layout.

For

Anyone who wants a binary time display without setup, accounts, or distractions.

Not for

If you need a time zone conversion or a reference time source. Use World Clock, UTC Clock, or Time Zone Converter.

Binary Clock →Digital Clock →Current Local Time →

Use BCD when you want digit-by-digit clarity

BCD shows each decimal digit of HH:MM(:SS) as 4 bits, so it stays aligned to familiar clock digits.

For

Anyone who wants to read binary time without re-learning how the digits map to hours and minutes.

Not for

If you want the hour/minute/second values as true binary numbers. Use Pure mode.

Binary Clock →Hexadecimal Clock →Morse Code Clock →

Use pure binary when you want real binary values

Pure mode converts hours, minutes, and seconds into binary numbers (bit widths sized for the field).

For

Anyone who wants the cleanest “real binary number” representation of time fields.

Not for

If you want one 4-bit group per decimal digit (00–09 per digit). That’s BCD mode.

Binary Clock →Epoch / Unix Time Clock →UTC Clock →

Hide seconds for a calmer display

Turn seconds off to reduce motion and keep the display stable while still updating cleanly on minute changes.

For

Desk displays, focus sessions, or any setup where constant second-ticking is distracting.

Not for

If you need a stopwatch-style view or elapsed time tracking. Use Stopwatch or Count Up Timer.

Binary Clock →Minimalist Clock →Pomodoro Timer →

Run a fullscreen wall display (presentation / stream)

Use fullscreen mode for a clean, readable binary clock that works well at a distance.

For

Presentations, streaming overlays, classrooms, or a second monitor wall clock.

Not for

If you want a generic fullscreen timer with duration controls. Use Fullscreen Timer.

Binary Clock →Fullscreen Timer →Presentation Timer →

Copy a shareable snapshot of the current moment

Copy captures a compact text snapshot including time, date, timezone label, binary output, and ISO timestamp.

For

Notes, logs, chats, or anywhere you want to paste the binary representation of “right now.”

Not for

If you need a permalink to a specific time. This page is designed for “now,” not historical lookup.

Binary Clock →Time Calculator →Milliseconds Converter →

Tip: If you want the most readable binary view, start with BCD and turn seconds off. If you want “real binary numbers,” switch to Pure mode.

Frequently Asked Questions

What does this Binary Clock do?

It shows your current local time and displays it in binary. You can switch between BCD (digit-by-digit) and pure binary modes, toggle seconds, switch 12/24-hour time, copy a snapshot, and use fullscreen.

What’s the difference between BCD and pure binary?

BCD (Binary-Coded Decimal) converts each decimal digit (0–9) into 4 binary bits, so the time stays aligned to the familiar HH:MM:SS digits. Pure binary converts the hour, minute, and second values into binary numbers (for example, minutes 0–59 are shown as a 6-bit binary value).

Does this show my local time or a specific time zone?

It shows your device’s local time. The page also displays a timezone label when your browser provides one, but it does not convert between time zones.

How often does the clock update?

The display updates aligned to the next whole-second boundary. Even if you hide seconds, it still updates on second boundaries so minute changes land cleanly.

Why do the hour bits change width between 12-hour and 24-hour?

In pure binary mode, hours use 5 bits in 24-hour mode (0–23) and 4 bits in 12-hour mode (1–12). Minutes and seconds use 6 bits (0–59).

What exactly gets copied when I press Copy?

Copy captures a snapshot of the current moment including your formatted time, timezone label, the date line, the binary representation for the selected mode, and an ISO timestamp as a UTC reference.

What keyboard shortcuts are supported?

After clicking the clock card once: F toggles fullscreen, C copies, S toggles seconds, B switches between BCD and pure binary, 1 sets 12-hour time, 2 sets 24-hour time, and Esc exits fullscreen.

Does fullscreen change anything about the time or conversion?

No. Fullscreen only changes the layout for easier viewing. The time and binary representation are the same.

Is this an atomic clock or synchronized to a time server?

No. It uses your device’s clock. If your system time is off, the displayed time (and binary output) will be off by the same amount.

Can I link to or share a specific time?

This page is designed for “now.” If you need to share a specific moment, use Copy to capture the snapshot text (including ISO) and paste it where you need it.

How this page helps

BCD + pure binary • Optional seconds • 12/24-hour • Copy friendly • Fullscreen + shortcuts

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See the current time in binary. The clock updates exactly on the next second boundary, so seconds and minutes flip cleanly with no “drift” feel.

Pick the binary style that matches your goal. Use BCD to see each decimal digit as 4 bits, or Pure binary to see hours, minutes, and seconds as real binary numbers.

Toggle seconds and 12/24-hour instantly. Hide seconds for a calmer display, or show them for a true “live” clock. Switch between 12-hour and 24-hour time without changing the underlying local time.

Fullscreen for a clean wall display. Go fullscreen for presentations, streams, or desk displays. Controls stay accessible, and Esc exits quickly.

Copy the current moment. Copy grabs a compact snapshot including your formatted time, date, timezone label, and the binary representation so you can paste it into notes or messages.

Keyboard shortcuts (fast control). Click the card once, then use F fullscreen, C copy, S seconds on/off, B mode, 1 (12h), 2 (24h), Esc exit.

Best-fit uses

Quick “what time is it?” Keep seconds off and use BCD for a readable binary-style clock.
Binary snapshot sharing Turn seconds on, choose your mode, then hit Copy to paste the moment anywhere.
Wall / stream display Use Fullscreen and 24-hour time for a clean, unambiguous display.

Related tools

Prefer a standard display? Digital Clock and Analog Clock.

Need a time reference? UTC Clock or World Clock.

Want another “encoded” clock? Hexadecimal Clock or Morse Code Clock.

Just want the plain current time line? Current Local Time.

Technical details▼

Modes

BCD displays each decimal digit as 4 bits (00–09 per digit). Pure displays hours/minutes/seconds as binary numbers (bit-width sized for the field).

Bit widths

In pure mode, minutes and seconds use 6 bits (0–59). Hours use 5 bits in 24-hour mode (0–23) and 4 bits in 12-hour mode (1–12).

Update timing

The display schedules updates aligned to the next whole-second boundary. Even if seconds are hidden, it still updates on second boundaries so minute changes land cleanly.

Time source + timezone

Time is shown using your device’s local clock and locale formatting. The timezone label is read from the browser’s Intl timezone when available.

Copy format

Copy includes: formatted time, timezone label, formatted date line, a binary line (mode-dependent), and an ISO timestamp as a UTC reference.

Fullscreen behavior

Fullscreen uses the browser Fullscreen API on the clock card. Press Esc to exit, or use the Exit control.

Heads up. This clock shows your device’s local time. If your system clock is off, the binary display will be off by the same amount.