Compare calculators

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

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.

Time Zones

Daylight Saving Time Impact Calculator

Quantify how many extra hours per week your meeting schedule is disrupted when DST transitions create a temporary offset mismatch between two regions. Use it during the spring and autumn transition weeks when one region has shifted clocks and the other has not.

Region 1 DST Status

Region 2 DST Status

Normal Time Difference (hours)

Meetings Per Week (meetings)

Fill in the required fields to see your result.

Key differences

	Circadian Rhythm Adjustment Calculator	Daylight Saving Time Impact Calculator
Category	Time Zones	Time Zones
Inputs required	5	4
Result	Recommended Bedtime Adjustment (hours)	Schedule Adjustment Impact (hours/week)
What it does	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.	Quantify how many extra hours per week your meeting schedule is disrupted when DST transitions create a temporary offset mismatch between two regions. Use it during the spring and autumn transition weeks when one region has shifted clocks and the other has not.