• Ham Clock 1
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Ham Clock

HamClock is targeted for portable amateur radio operators. It displays time/date and user notes related to various portable locations on a single screen:
- Local date / time
- GMT date / time
- User notes
- Reminder to transmit callsign every 10 minutes, as required in some countries.
Note can be entered in up to four fields. Use it to record location name, QTH locator, callsign, activation details for SOTA, WCA, WFF or other activities, event info etc.

Multiple notes can be entered and saved for later use.Note view is scrolled to show longer textsHide local clock, leaving even more room for notes


- Large font and contrast for readability in bright daylight.
- Light / dark color scheme
- Configurable date format
- Configurable display timeout.
- Optional popup every 10 minutes to remind you to transmit your callsign.
- Optional ringtone played along with the visual reminder. If you don't want audio alert, select "silent" or "none" ringtone.


- Share note content as a simple text file, formatted as JSONArray (string). Extension is .hctxt (HamClockTxt) but can be edited in any text editor.Sharing works best via Gmail or GoogleDrive. With Gmail, open/receive directly from an attachment (no need to download the attachment first). If proper JSONArray file format is detected, "save or discard note" is offered.

Sharing via Bluetooth is less reliable on different devices, because android versions and phone vendors vary in trusted file types for BT transfers, and in permissions needed to access bluetooth storage space (received files).Sharing via other applications is not tested, and it may or may not work.

PRIVACY / DISCLAIMERThis app does not collect any personal data or share anything with anyone.There are NO ads.

Category : Tools

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Reviews (27)

Noa. P. Apr 12, 2021     

The app is great by itself but it's not quite what I'm looking for. I need a quick utc reference so what I really need is a widget. There should be an option to easily create a widget within the android sdk so of you could do that sometime I'd be willing to pay for the upgrade.

M. A. May 9, 2021     

I'll give it points for displaying both local and UTC times together, but there REALLY ought to be an option for displaying seconds as well as minutes. Seems rather pointless without the seconds.

Riv. L. R. Sep 12, 2020     

Tool that does One Thing Well! Thank you, it was hard to find a UTC+local time clock. I do agree that a widget would be a great addition, but I'm perfectly pleased with it as is.

Vin. S. Oct 19, 2021     

Was hoping that there would be metadata associated with notes (utc time of creation at least). Is there any way to enable a copy and paste function in the time windows so either could be quickly captured and used in notetaking?

Qi. F. Oct 11, 2018     

It would be nice to have an option to display the seconds, for setting wspr beacon clocks on devices that don't have internal RTC backup power.

Mik. P. Mar 8, 2020     

Great app overall. Would like to see a little more customizability in font size and color. Highly recomended.

Ste. A. Mar 2, 2020     

Perfect app - does exactly what you want with no confusing extra stuff that you don't need for ham use. Congratulations on a great and simple app.

Jer. J. Jun 28, 2019     

Works well! Everything valued for use in the field is included in the app. The Notes section is a nice touch. Thanks, Zoran!

Sur. L. Aug 19, 2021     

Good. But we need an option to enter the time because we might have contacted earlier than the current local time and want to know the UTC time. Anyway this is useful.

Joh. M. Mar 19, 2019     

Does what I need. UTC and local time with timer that you can turn off if you want. Great app.

Gar. H. Apr 22, 2019     

Very nice; simple but configurable; free of charge; no ads.

Eri. P. Nov 6, 2019     

This is a good app but i need to be able to show seconds (if it has this please tell me how). If it had that would be 5 stars.

Bri. J. Aug 23, 2020     

Does the job nicely. Would have liked a small version as my display clock widget.

Eri. K. Jan 31, 2019     

Clean, clear, simple. Would love option to display dates and times in ISO 8601 format, for example, 2019-01-31 14:51Z for UTC and 09:51-05:00 for USA Eastern Standard Time

Jai. P. Sep 22, 2019     

Good app but i am unable to use bottom.display to type anything. It is showing clock only

Ken. S. Nov 16, 2020     

Works well but badly needs 12 our mode as well because 24 hour mode clock confused me badly

Ria. M. K. Aug 10, 2020     

Awesome. Just needs a widget for keeping UTC on a home screen.

Way. S. Dec 12, 2020     

Clock works.... but no audible at the ten minute mark.

Ken. P. Sep 5, 2019     

Love this app. I use it every time I'm working the HF bands.

Joh. L. Jun 10, 2019     

works great, but now when I download a PDF Document this app tries to open it.

Jus. S. Apr 19, 2021     

I am a Shortwave listener and im very impressed with this app!!😀

Jor. M. Oct 4, 2018     

Simple UTC clock for filling in my paper log on amateur radio.

Rud. P. Jun 9, 2021     

I don't believe this clock recognizes states that do not go on DST.

Van. B. Apr 27, 2020     

It's what I needed and free! Thanks dev.

Sam. D. Dec 29, 2020     

Great app to have. Thank you for the development!

mar. k. Jul 16, 2021     

Been using it for years, just adding to a new phone no more

And. H. May 10, 2021     

Exactly what you want if you just need to convert UTC to your local time.