Israel/Hebrew Holidays displayed one day early

[garteful]

Checklist

• [x] I can reproduce the bug with the latest version given here.
• [x] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [x] I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• [x] I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• [x] I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• [x] This issue contains only one bug.
• [x] I have read and understood the contribution guidelines.

Affected app version

1.6.1

Affected Android/Custom ROM version

Android 12

Affected device model

Redmi Note 9 pro

How did you install the app?

F-Droid / IzzyOnDroid

Which calendar service or provider do you use, if any?

No response

Which sync adapter app do you use for calendar synchronization, if any?

No response

Steps to reproduce the bug

1. Open the Fossify calendar app.
2. Add holiday.
3. Chose State of Israel holidays.
4. Apply to Fossify calendar.

Expected behavior

Holidays should be displayed on the correct dates according to the Hebrew calendar, which usually starts in the evening before.

Actual behavior

Israel/Hebrew calendar holidays shown 1 day before the original day, and doesn't show the holiday's eve.

View holidays in September–October 2025

Examples:

"Rosh Hashanah" (Hebrew New Year) is shown on Monday and Tuesday: September 22nd and 23rd, actually it must shown on: Tuesday and Wednesday September 23 and 24.

In addition, an Hebrew holiday starts on the evening before the holiday itself, so this holiday's evening is missing as well (on this example, Rosh Hashanah Eve is on Monday, September 22nd, 2025 (Total, this holiday includes 1 Eve, 2 days).

"Yom Kippur" is shown on Wednesday, October 1st. Actually, Yom Kippur eve is on Wednesday, October 1st, and Yom Kippur is on Thursday, October 2nd (Total, this holiday includes 1 Eve and 1 Day).

Screenshots/Screen recordings

Green = Holidays calendar (from Fossify's calendar source). Wrong dates.

Red = Hebrew holidays (Jewish holidays, from Google calendar). Correct dates.

Additional information

This affects all Jewish holidays. Might need to align with official Hebrew calendar (e.g., via Hebcal or similar sources).

Thanks in advance.