Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Daylight Saving Time Impact Calculator

Quantify the disruption daylight saving time changes cause to your personal schedule, factoring in sleep sensitivity, adjustment period, and the gap between your work start time and current routine. Use it before clock changes to plan a gradual adaptation strategy.

Current Schedule Time (h)

DST Change Type

Adjustment Period (days)

Sleep Sensitivity

Work Start Time (h)

Fill in the required fields to see your result.

Time Zones

Circadian Rhythm Adjustment Calculator

Estimate your adjusted bedtime target when shifting your sleep schedule across time zones before or after travel. Helps frequent flyers and shift workers gradually phase-shift their circadian clock to minimize jet lag.

Current Time Zone (UTC offset)

Target Time Zone (UTC offset)

Current Bedtime (h)

Pre-travel Adjustment Days (days)

Light Sensitivity

Fill in the required fields to see your result.

Key differences

	Daylight Saving Time Impact Calculator	Circadian Rhythm Adjustment Calculator
Category	Time Zones	Time Zones
Inputs required	5	5
Result	Adjustment Difficulty Score (points)	Recommended Bedtime Adjustment (hours)
What it does	Quantify the disruption daylight saving time changes cause to your personal schedule, factoring in sleep sensitivity, adjustment period, and the gap between your work start time and current routine. Use it before clock changes to plan a gradual adaptation strategy.	Estimate your adjusted bedtime target when shifting your sleep schedule across time zones before or after travel. Helps frequent flyers and shift workers gradually phase-shift their circadian clock to minimize jet lag.