Hours & Time Duration Counter
Pick a start and end time — see total hours and decimal hours instantly. Handles overnight shifts.
100% Secure. Calculations run locally — your data never leaves your browser.
Overnight shifts wrap automatically (e.g. 22:00 → 06:00 = 8 hours).
Duration
—
Enter a start and end time.
Hours & Duration — answers & formulas
Deep-dive formulas, definitions, and worked examples — indexed for search and ready to share.
Math HistoryLondon · 1843
The First Algorithm Ever Written
While translating notes on Charles Babbage's Analytical Engine, Ada Lovelace appended an algorithm to compute Bernoulli numbers — a method so meticulous it is widely considered the first computer program. She also predicted machines would one day compose music and manipulate symbols, not just numbers.
3 / 4