Note: The database is currently offline. You may download measured historical frequency data as CSV-files here:
-> Historical frequency data

The record of the frequency started on 2015/02/25.  From this point on all frequencies are available as its cycle tuned to seconds.

On the right sidebar you have the opportunity to enter a specific date and time. It is important to make sure that the date is entered in the following form. Here is an example:


The file is provided in csv-format. For this purpose, it is recommended to have Microsoft Office, Open Office or similar software. The download will start the next few seconds after confirming.

If you open it in Excel it looks like this:


If you want to see the digits of seconds, you need  to adjust the display format at the column “Frequency” to get it in the form of “TT:MM:YYYY hh:mm:ss”. The standard form is usually set as “TT:MM:YYYY hh:mm”. You can change it in the user specific settings as you right-click your column and press “Format”.

Maybe you are surprised about the column were “Millisecond” is displayed. This column’s content describes an additional datetime information.

For example, the combination of the following column


results to the format “TT:MM:YYYY hh:mm:ss:” :                                                                           Millisecond3

The form of presentation of the values is up to you then.