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- DLTSTD.COM
- Version 2.2
-
- A Utility for Predicting Dates for U.S.
- Daylight and Standard Time Changes, 1992-2100
-
- by
-
- Pete Petrakis
- Life Sciences Software
- Stanwood, Washington
-
- CIS 76555,1175
-
-
- Description
-
- DLTSTD.COM calculates the starting dates for U.S. daylight and standard
- time for any year between 1992 and 2100. The program is based on the current
- rule by which daylight saving time begins on the first Sunday in April and
- standard time begins on the last Sunday in October, both at 02:00:00 local
- time.
-
- Given Congress' propensity to change the official starting times for these
- seasons every few years, there is no assurance that the program will be
- useful through 2100. For example, at this time (April 1993), a bill is
- pending in Congress to have daylight saving time begin on the third Sunday
- in March and end on the first Sunday in November. The bill also includes a
- provision to consider the feasibility of advancing clocks yet another hour
- during the summer months, for a total of four time season changes a year --
- a one-hour advance in early spring, another one-hour advance in summer, a
- one-hour setback in early fall, and finally reversion to standard time in
- late fall.
-
-
- Running the Program
-
- Just type DLTSTD in DOS and enter a desired year at the prompt. The
- program displays up to six sets of starting dates per screen, in two columns
- (Figure 1). JDate indicates the Julian date for the corresponding calendar
- date for a season change. After the sixth set of dates is displayed, a prompt
- appears at the bottom of the screen. Pressing Return clears the screen in
- preparation for a new set of years; pressing ESC at that prompt ends the
- program.
-
-
- Figure 1. DLTSTD Screen
- ┌────────────────────────────────────────────────────────────────────────────┐
- │ U.S. TIME SEASON CHANGES (1992-2100) Version 2.2 │
- ├────────────────────────────────────────────────────────────────────────────┤
- │ First Sunday in April: Daylight Time (advance clock 1 hour) │
- │ Last Sunday in October: Standard Time (set clock back 1 hour) │
- │ (Changes occur at 02:00:00 local time) │
- ├────────────────────────────────────────────────────────────────────────────┤
- │ Copyright 1993 Life Sciences Software │
- └────────────────────────────────────────────────────────────────────────────┘
- Hit Return at Year prompt to quit
-
- 2053 JDate Enter year:
- Daylight time: Apr 06, 2053 2470999
- Standard time: Oct 26, 2053 2471202
-
- 2054 JDate
- Daylight time: Apr 05, 2054 2471363
- Standard time: Oct 25, 2054 2471566
-
- 2055 JDate
- Daylight time: Apr 04, 2055 2471727
- Standard time: Oct 31, 2055 2471937
-
-
- Distribution
-
- DLTSTD is a free program and may be distributed by anyone provided no money
- is charged for it.
-
-
- Disclaimer
-
- There is no conceivable reason why this program should cause any harm since
- all it does is calculate and display dates. Nevertheless, Life Sciences
- Software disclaims responsibility for any adverse effects resulting from its
- use.
-
-
- Pete Petrakis
- Life Sciences Software
- Stanwood, Washington
- April 1993
-