Frequently Asked Questions

The software calculates the days of separation based on the period dates you enter. It checks whether the dates indicate a fixed or non-fixed veset, and displays all the required days of observance, including:

• Veset haflagah (interval) and veset hachodesh (monthly date)
• Onah beinonis according to the various opinions
• Fixed veset – monthly, interval, alternating and skipping patterns

For each day of separation, the software states the reason for it.

The software runs on Windows computers. You can download it in two ways:

• Microsoft Store – recommended, no security warnings
• EXE file – suitable for installing without internet or moving to another computer

Yes. The software has been checked and approved on NetFree. If you encounter a problem downloading through the Microsoft Store on NetFree, we recommend contacting NetFree support, or alternatively downloading the EXE file directly from our site.

The software lets you choose between 5 options:

• Sephardic custom
• Sephardic custom – stringent
• Ashkenazi custom
• Ashkenazi custom – stringent
• Custom – choose each parameter separately

Each custom determines how the various separations are calculated, such as the preceding onah, short haflagah, fixed veset and more. When in doubt – please consult a Rav.

You can return to the settings screen at any time by clicking the "System Settings" icon on the toolbar, or via the Tools → Settings menu.

For each period, enter three details:

• The Hebrew date on which it began (the first day of the cycle)
• The onah – day or night
• The duration – the number of days from start to finish

You can also enter a birth date (which cancels non-fixed vestos before it) or a sighting not for calculation.

In the top menu choose: Tools → Hebrew (or Tools → English)

In the Hebrew interface: כלים ← עברית / English

After selecting, the software switches to the chosen language.

• Gray circle – separation required in the marked onah (right = night, left = day)
• Red circle – Or Zarua observance (for those who follow it)
• Question mark ? – consult a Rav
• Right side of the cell – night onah
• Left side of the cell – day onah

This mark indicates a case of halachic doubt that the software detects, such as a fixed veset that exists only according to some opinions. In these cases, please consult a Rav according to your custom.

To locate the data folder:

• Press Windows + R on the keyboard
• Paste: %AppData%\..\Local\TaharaDate
• Press Enter – the folder will open

Alternatively, from within the software: Help → Open Data Folder

Copy the following three files for backup:

• Net.ndd – the main data file
• def.net – the system settings file
• Net.ndd.csv – view the data as a spreadsheet

In the top menu: Tools → Change Name and Password (keyboard shortcut: Z)

You can change them at any time. The password is protected, and only someone who knows it can open the software.