How each state counts the period
The count is done with the same functions that print the date on the notice itself, so a purchased notice and this page always agree. Florida's seven-day notices for lease violations run from receipt and print no computed date, so they are not here; Wisconsin's period depends on the tenancy type, so it is not here either.
Florida — Three-day notice to pay rent or vacate
The day the notice is delivered is not counted. The period runs from the next day and ends on the third day that is not a Saturday, Sunday, or court-observed legal holiday.
Source: Fla. Stat. § 83.56(3), which prescribes the notice and excludes Saturday, Sunday, and legal holidays from the three days; § 83.56(4) for the delivery methods.
Texas — Notice to pay rent or vacate
Calendar days are counted from the day after delivery. When the last day falls on a Saturday, Sunday, or a state or federal holiday, the period runs to the next day that is not.
Source: Tex. Prop. Code § 24.005 (at least three days' written notice unless a written lease provides a different period); § 24.005(f-3) for the delivery methods; § 24.0042 for computing the period.
Nebraska — Seven-day notice to pay rent or terminate
Seven calendar days after the notice is given; the day it is given is not counted.
Source: Neb. Rev. Stat. 76-1431(2) (seven days to pay after written notice of the nonpayment and of the intention to terminate); 76-1413 (how notice is given and when it is received).
Michigan — Demand for possession, nonpayment of rent
Seven calendar days from service of the demand; the day of service is not counted.
Source: MCL 600.5714(1)(a) (seven days from service of the demand for nonpayment of rent); MCL 600.5716 (what the demand must contain).
Prepare the Nebraska notice