When Passover falls on a weekly Sabbath, which occurs approximately 13 percent of the time, it impacts the calendar rules for determining the start of the count to Pentecost. In such years, the first day of Unleavened Bread, a high holy day Sabbath, falls on a Sunday, and the last day of Unleavened Bread, another high holy day Sabbath, coincides with the weekly Sabbath. This weekly Sabbath on the last day of Unleavened Bread is the only one within the Feast of Unleavened Bread in those years. To maintain a fixed and consistent rule, the count to Pentecost begins the next day, which is one day outside the Feast of Unleavened Bread. No scriptural evidence has been found to countermand this rule. Passover, though occasionally falling on a weekly Sabbath, does not qualify as a weekly Sabbath within the Feast of Unleavened Bread, as Leviticus 23:5-6 clearly distinguishes Passover on the fourteenth day of the first month from the Feast of Unleavened Bread starting on the fifteenth day. Using Passover as the starting point for the count is inconsistent with the method applied in the majority of years when Passover does not fall on a Sabbath.

According to Hebrew Calendar rules, Passover, observed on Nisan 14, can fall only on a Monday, Wednesday, Friday, or weekly Sabbath. Over the past century, it has occurred on Monday, Wednesday, or Friday in just over 87% of the years. When Passover falls on a Monday, the weekly Sabbath within the Days of Unleavened Bread is Nisan 19, and Wavesheaf Day, the start of the count to Pentecost, is Sunday, Nisan 20. If Passover is on a Wednesday, the weekly Sabbath is Nisan 17, with Wavesheaf Day on Sunday, Nisan 18. When Passover occurs on a Friday, the weekly Sabbath coincides with Nisan 15, the First Day of Unleavened Bread, making Wavesheaf Day Nisan 16. The date of Wavesheaf Day shifts based on the day of Passover, which in turn affects the date of Pentecost. Since the weekly Sabbath is always on a Saturday, Wavesheaf Day consistently falls on a Sunday, and counting fifty days from that point ensures Pentecost also occurs on a Sunday. These rules also allow for Wavesheaf Day to occasionally fall outside the Days of Unleavened Bread, following the established patterns of the Hebrew Calendar.