Date can very if the Feast Day falls on Soul Saturday, it will be the day before.
…After Prayers that night, for a second time the soldiers heard the Voice of the Lord: “He who believes in Me, though he die, yet shall he live. Be bold and have no fear of short-lived torment which soon passes; endure… that you may receive Crowns.”…
The Holy 40 Martyrs said to each other: “By stripping off our garments we have put off the old man. The winter is cold and bitter, but Paradise will be warm and sweet. The freezing is painful, but the reward will bring us joy. Let us not be defeated, O brothers! We suffer a little, but Christ will Crown us with the laurel of victory. He is our God and the Saviour of our Souls.”