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Date & Time tools
8 free date & time tools — private and offline.
Age Calculator
exact age from a birth date
Date Difference
days/weeks between two dates
Add / Subtract Days
date N days from a date
Business Days
weekdays between two dates
Countdown
time left until a date
Due Date
estimate from last period (Naegele)
Time Duration
hours between two clock times
Meeting Time Across Time Zones
one meeting time on everyone's clock, with the day it lands on