NumLuma›Calculators›Date & Time Calculators

Count time without guesswork

Date & Time Calculators

Calendar and clock questions are easy to get wrong by hand, especially across months, leap years and mixed time units. These tools keep the underlying dates or durations explicit so the result can be checked.

NumLuma Journey

A useful order, not just a list.

Start with the first question, then move through the connected calculations. You can jump in anywhere, but the sequence keeps the task coherent.

Step 1 of 6

01 Start here Age

Find age between two dates.

02 Next calculation Date Difference

Count days between two dates.

03 Next calculation Days Until

Count days to a target date.

04 Next calculation Time Duration

Calculate elapsed hours between two times.

05 Next calculation Work Hours

Calculate hours in a shift.

06 Next calculation Time Card

Total weekly hours and gross pay.

Start calculating

Everything you need for this job.

Each tool is free, works without an account and links to its formula, assumptions and related calculators.

Browse all calculators →

ED Everyday

Age Calculator

Find age between two dates.

NL / ED Open

ED Everyday

Date Difference Calculator

Count days between two dates.

NL / ED Open

ED Everyday

Days Until Calculator

Count days to a target date.

NL / ED Open

ED Everyday

Time Duration Calculator

Calculate elapsed hours between two times.

NL / ED Open

WK Work

Work Hours Calculator

Calculate hours in a shift.

NL / WK Open

WK Work

Time Card Calculator

Total weekly hours and gross pay.

NL / WK Open

CV Conversions

Time Converter

Convert common time units.

NL / CV Open

Before you calculate

Useful context, not filler.

NumLuma groups tools around real tasks so you can move from one calculation to the next without starting your research over.

Why can date differences be tricky?

Months have different lengths, leap years add a day, and calendar differences are not always equivalent to dividing a day count by a fixed number.

Should work-hour calculations include unpaid breaks?

Only if you enter the schedule that way. For payroll or policy decisions, confirm how the employer or local rules treat breaks and rounding.