Zman Shift - how permanent daylight saving time would change davening
Congress is weighing the Sunshine Protection Act, which would make daylight saving time permanent across the United States. The bill passed the House 308–117 in July 2026 and is now before the Senate. It would not move the sun — it would move the clock: every winter sunrise, and every sun-based Jewish prayer time (zman), would read one hour later.
Zman Shift is a free interactive calculator that shows the impact city by city. Under permanent DST, winter sunrise / netz would read as late as 8:20 AM in Brooklyn, 9:02 AM in Detroit, and 9:13 AM in South Bend, Indiana — making it impossible in many communities to finish morning prayers (Shacharit) with a minyan before leaving for work. On the other side of the ledger, winter Friday candle-lighting would move about an hour later.
What the app shows
- Every halachic time — alot hashachar, misheyakir, netz hachama (sunrise), sof zman Shema, sof zman tefillah, shkiah (sunset), tzeit hakochavim, and candle lighting — for any date and any of 112 US cities
- Three clock scenarios compared: permanent daylight saving time, today's law, and permanent standard time
- A full-year day/night chart, and a minyan calculator that counts how many days you could no longer finish davening before work
This page is an interactive application — enable JavaScript to use it. Zmanim are computed with standard astronomical formulas; the tool is informational, not a halachic ruling.