5 calculators live

Date & Time Calculators

Ages, durations, working hours and calendar arithmetic.

Age Exact age, total days lived, and your next birthday countdown. 2 inputs Open → Date Days between two dates, or a date plus/minus a day count. 2 inputs Open → Hours Clock in, clock out, subtract a break — net hours worked. 3 inputs Open → Time Card A full week of clock-ins and clock-outs, totalled and split into regular and overtime hours. 21 inputs Open → Week Number The ISO week number for any date — handles year-boundary weeks correctly. 1 input Open →