April 28th, after sunset, is the 14th day of Iyyar on the Hebrew calendar. Those who were unable to keep the Passover on the 14th of Nisan (about a month ago) are authorized by scripture to keep the Passover then.
This is based upon the following passages of scripture:
1 Now the Lord spoke to Moses in the Wilderness of Sinai, in the first month of the second year after they had come out of the land of Egypt, saying: 2 “Let the children of Israel keep the Passover at its appointed time. 3 On the fourteenth day of this month, at twilight, you shall keep it at its appointed time. According to all its rites and ceremonies you shall keep it.” 4 So Moses told the children of Israel that they should keep the Passover. 5 And they kept the Passover on the fourteenth day of the first month, at twilight, in the Wilderness of Sinai; according to all that the Lord commanded Moses, so the children of Israel did.
6 Now there were certain men who were defiled by a human corpse, so that they could not keep the Passover on that day; and they came before Moses and Aaron that day. 7 And those men said to him, “We became defiled by a human corpse. Why are we kept from presenting the offering of the Lord at its appointed time among the children of Israel?”
8 And Moses said to them, “Stand still, that I may hear what the Lord will command concerning you.”
9 Then the Lord spoke to Moses, saying, 10 “Speak to the children of Israel, saying: ‘If anyone of you or your posterity is unclean because of a corpse, or is far away on a journey, he may still keep the Lord’s Passover. 11 On the fourteenth day of the second month, at twilight, they may keep it. They shall eat it with unleavened bread and bitter herbs. 12 They shall leave none of it until morning, nor break one of its bones. According to all the ordinances of the Passover they shall keep it. 13 But the man who is clean and is not on a journey, and ceases to keep the Passover, that same person shall be cut off from among his people, because he did not bring the offering of the Lord at its appointed time; that man shall bear his sin. (Numbers 9:1-13)
Centuries later, basically the entire tribe of Judah all did this one year (and had some from other tribes join them):
1 And Hezekiah sent to all Israel and Judah, and also wrote letters to Ephraim and Manasseh, that they should come to the house of the Lord at Jerusalem, to keep the Passover to the Lord God of Israel. 2 For the king and his leaders and all the assembly in Jerusalem had agreed to keep the Passover in the second month. 3 For they could not keep it at the regular time, because a sufficient number of priests had not consecrated themselves, nor had the people gathered together at Jerusalem. (2 Chronicles 30:1-3)
As most everyone knows, Jesus kept the Passover, from the time of His youth. Luke records:
His parents went to Jerusalem every year at the Feast of the Passover. And when He was twelve years old, they went up to Jerusalem according to the custom of the feast (Luke 2:41-42).
Jesus continued to keep the Passover throughout His entire life. He kept it once per year. Passover was an annual event for Him and others (Exodus 13:10) and was normally observed on the fourteenth day of the month of the first month (called Abid in Deuteronomy 16:1 or Nisan in Esther 3:7):
On the fourteenth day of the first month at twilight is the LORD’s Passover (Leviticus 23:5).
And Jesus had his disciples also keep it and told them to keep it as a remembrance to Him:
7 Then came the Day of Unleavened Bread, when the Passover must be killed. 8 And He sent Peter and John, saying, “Go and prepare the Passover for us, that we may eat.” 9 So they said to Him, “Where do You want us to prepare?” 10 And He said to them, “Behold, when you have entered the city, a man will meet you carrying a pitcher of water; follow him into the house which he enters. 11 Then you shall say to the master of the house, ‘The Teacher says to you, “Where is the guest room where I may eat the Passover with My disciples?”‘ 12 Then he will show you a large, furnished upper room; there make ready.” 13 So they went and found it just as He had said to them, and they prepared the Passover. 14 When the hour had come, He sat down, and the twelve apostles with Him. 15 Then He said to them, “With fervent desire I have desired to eat this Passover with you before I suffer; 16 for I say to you, I will no longer eat of it until it is fulfilled in the kingdom of God.” 17 Then He took the cup, and gave thanks, and said, “Take this and divide it among yourselves; 18 for I say to you, I will not drink of the fruit of the vine until the kingdom of God comes.” 19 And He took bread, gave thanks and broke it, and gave it to them, saying, “This is My body which is given for you; do this in remembrance of Me.” 20 Likewise He also took the cup after supper, saying, “This cup is the new covenant in My blood, which is shed for you. (Luke 22:7-20)
If you are baptized and were unable to keep the Passover on the 14th of Nisan, like is taught in Leviticus 23, you can keep it after sunset May 9 this year. For specific details as to how, please check out the article Keeping Passover and the Days of Unleavened Bread.
Here is a link to an online service: CCOG Passover Service.
Some items of possibly related interest may include:
Keeping Passover and the Days of Unleavened Bread How should Christians keep Passover, especially if they are by themselves. Why does the Church of God not require lambs for Passover? How does one keep the Days of Unleavened Bread? For a step-by-step video for Christians to keep it, check out a CCOG Passover Service. Here is a link to a related article in the Spanish language: Guardando la Pascua y los Días de los Panes sin Levadura.
Preparing for Passover The Apostle Paul taught that Christians should examine themselves prior to taking Passover. This YouTube video sermon gives suggestions on how to prepare.
Passover and the Early Church Did the early Christians observe Passover? What did Jesus and Paul teach? Why did Jesus die for our sins? There is also a detailed YouTube video available titled History of the Christian Passover.
The Passover Plot What was the first Passover plot? Which plots have Islam and the Greco-Roman faiths perpetuated about Passover? A sermon video of related interest is The Passover Plots, Including Easter.
Melito’s Homily on the Passover This is one of the earliest Christian writings about the Passover. This also includes what Apollinaris wrote on the Passover as well. Here is a related sermon, also titled Melito’s Homily on the Passover.
Holy Day Calendar This is a listing of the biblical holy days through 2024, with their Roman calendar dates. They are really hard to observe if you do not know when they occur 🙂 In the Spanish/Español/Castellano language: Calendario de los Días Santos. In Mandarin Chinese: 何日是神的圣日？ 这里是一份神的圣日日历从2013年至2024年。.
Should You Keep God’s Holy Days or Demonic Holidays? This is a free pdf booklet explaining what the Bible and history shows about God’s Holy Days and popular holidays.