🌅 DST Simulator

Explore daylight saving time transitions and discover the mysterious hours that don't exist or happen twice. Pick a timezone and scrub through the spring forward and fall back periods.

🌅 Spring Forward

Date: March 9, 2025
Time: 02:00
Change: UTC-5 → UTC-4

What Happens?

Clocks spring forward, skipping one hour. Times like 2:30 AM don't exist.

Interactive Timeline

01:0002:0003:0004:00
Current Time
NONEXISTENT
This time does not exist!
UTC Time
07:30:00
Always reliable
Offset
UTC-5
From UTC

How to Handle This in Code

from datetime import datetime
from zoneinfo import ZoneInfo

# Attempting to create nonexistent time
try:
    dt = datetime(2025, 2, 9, 2, 30, tzinfo=ZoneInfo("America/New_York"))
    print(f"Created: {dt}")
except Exception as e:
    print(f"Error: {e}")

# Safe approach - use UTC first
utc_dt = datetime(2025, 2, 9, 7, 30, tzinfo=ZoneInfo("UTC"))
local_dt = utc_dt.astimezone(ZoneInfo("America/New_York"))
print(f"Safe conversion: {local_dt}")