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104TH GENERAL ASSEMBLY
State of Illinois
2025 and 2026
HB5400

Introduced 2/10/2026, by Rep. Daniel Didech

SYNOPSIS AS INTRODUCED:

5 ILCS 440/1

from Ch. 1, par. 3201

Amends the Time Standardization Act. Exempts the State, after Iowa
and Missouri are exempt, from daylight saving time under the exemption
provisions of the federal Uniform Time Act of 1966 and declares the
standard time in the State year-round to be United States standard central
time. Makes findings.
LRB104 16305 BDA 29691 b

A BILL FOR

HB5400
LRB104 16305 BDA 29691 b
1

AN ACT concerning government.

2

Be it enacted by the People of the State of Illinois,
3
represented in the General Assembly:

4

Section 5.
Findings.
The General Assembly hereby finds and
5
declares as follows:
6

(a) Changing clocks seasonally is disruptive to the
7
health, safety, education, and economy of the people of the
8
State of Illinois.
9

(b) Federal law only permits permanent standard time by
10
exemption from daylight saving time as the alternative to
11
seasonally changing clocks.
12

(c) Permanent daylight saving time has historically been
13
repealed due to its harmful effects soon after its trials
14
during World War II and the 1970s Oil Crisis.
15

(d) Permanent standard time has historically proven to
16
last without incident for decades.
17

(e) The American Academy of Sleep Medicine, National Sleep
18
Foundation, Sleep Research Society, and Society for Research
19
on Biological Rhythms advise against permanent daylight saving
20
time and recommend permanent standard time.
21

(f) Standard time is intended to approximate natural solar
22
time.
23

(g) Coordination with contiguous states regarding
24
timekeeping is essential to convenience of commerce.

HB5400
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LRB104 16305 BDA 29691 b
1

Section 10.
The Time Standardization Act is amended by
2
changing Section 1 as follows:

3

(5 ILCS 440/1)

(from Ch. 1, par. 3201)
4

Sec. 1.
5

(a)(1) This subsection (a) becomes inoperative if
6
subsection (b) becomes operative.

7

(2)
At two o'clock ante meridian of the second Sunday in
8
March of each year, the standard time in this State shall be
9
advanced one hour, and at two o'clock ante meridian of the
10
first Sunday in November of each year the standard time in this
11
State shall, by the retarding of one hour, be made to coincide
12
with the mean astronomical time of the ninety degrees of
13
longitude West from Greenwich, the standard official time of
14
which is described as United States standard central time, so
15
that between the second Sunday of March at two o'clock ante
16
meridian in each year and the first Sunday in November at two
17
o'clock ante meridian in each year the standard time in this
18
State shall be one hour in advance of the United States
19
standard central time: Provided, however, that nothing in this
20
Act shall be so construed as to be in contravention of any
21
federal law or authorized order of the Interstate Commerce
22
Commission with respect to the time zones of the United
23
States. And in all laws, statutes, orders, judgments, rules
24
and regulations relating to the time of performance of any act

HB5400
- 3 -
LRB104 16305 BDA 29691 b
1
of any officer or department of this State, or of any county,
2
township, city or town, municipal corporation, agency or
3
instrumentality of the State, or school district or school
4
authority or relating to the time in which any rights shall
5
accrue or determine, or within which any act shall or shall not
6
be performed by any person subject to the jurisdiction of the
7
State, and in all the public schools and in all institutions of
8
the State, or of any county, township, city or town, municipal
9
corporation, agency or instrumentality of the State or school
10
district or school authority, and in all contracts or choses
11
in action made or to be performed in the State, it shall be
12
understood and intended that the time shall be the time
13
prescribed in this Section.
14

(3)
If the date on which time is to be advanced one hour,
15
the date on which time is to be retarded one hour, or both, as
16
set forth under Section 260a of the federal Uniform Time Act of
17
1966 (15 U.S.C. 260a), as now or hereafter amended,
18
renumbered, or succeeded, differs from either or both of those
19
dates as set forth under this Section, then the dates set forth
20
under the federal law shall control and shall apply in
21
Illinois, notwithstanding the dates set forth in this Section.
22

(b)(1) This subsection (b) becomes operative on the first
23
day of January in the first year following or coinciding with
24
the date upon which exemption from daylight saving time in the
25
states of Iowa and Missouri takes effect.
26

(2) The standard time in this State shall be made to

HB5400
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LRB104 16305 BDA 29691 b
1
coincide year-round with the mean astronomical time of the 90
2
degrees of longitude West from Greenwich, the standard
3
official time of which is described as United States standard
4
central time in the Uniform Time Act of 1966, 15 U.S.C. 261 and
5
263. The State, acting under the exemption provisions of the
6
federal Uniform Time Act of 1966, 15 U.S.C. 260a, shall be
7
exempt from the provisions of that law that establish daylight
8
saving time. And in all laws, statutes, orders, judgments,
9
rules, and regulations relating to the time of performance of
10
any act of any officer or department of this State, or of any
11
county, township, city or town, municipal corporation, agency
12
or instrumentality of the State, or school district or school
13
authority or relating to the time in which any rights shall
14
accrue or determine, or within which any act shall or shall not
15
be performed by any person subject to the jurisdiction of the
16
State, and in all the public schools and in all institutions of
17
the State, or of any county, township, city or town, municipal
18
corporation, agency or instrumentality of the State, or school
19
district or school authority, and in all contracts or choses
20
in action made or to be performed in the State, it shall be
21
understood and intended that the time shall be the time
22
prescribed in this Section.

23
(Source: P.A. 95-725, eff. 6-30-08
.)

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