It looks like an error on the page for April 9, 1942. It says the 7th day of Pesach and the 7th day of the Omer. If you click on After Sunset, then there is no Hebrew date at all.

Thanks for your message. According to our calendar, April 9, 1942 (before sundown) is the 8th day of Pesach, not the 7th day of Pesach:

Thu, 9 April 1942 = 22nd of Nisan, 5702

כ״ב בְּנִיסָן תש״ב

Parashat Shmini

7th day of the Omer

🫓 Pesach VIII 🫓 in the Diaspora

If you click after sunset you will see this:

Thu, 9 April 1942 after sunset = 23rd of Nisan, 5702
כ״ג בְּנִיסָן תש״ב
Parashat Shmini
8th day of the Omer

Note the Hebrew date is displayed in two different places:

In Hebrew: כ״ג בְּנִיסָן תש״ב

In transliteration: 23rd of Nisan, 5702