Date Time and Productivity Utilities & Operator Guides
Date differences, age, working days, timezone comparison and birthday number arithmetic.
Quick Summary / Direct Answer
OpenTools has 39 working date time and productivity tools. Each one runs in your own browser tab, so your files and inputs never touch a server. There is no account and no paywall.
Category Specifications
Working tools
39
Server upload
None
Runs on
Your browser
Cost
Free, no paywall
All Date Time and Productivity tools
Read the guide, or open the tool straight away.
Date Difference Calculator
Run date difference calculator in your browser tab.
Add Days to Date
Run add days to date in your browser tab.
Subtract Days from Date
Run subtract days from date in your browser tab.
Business Days Calculator
Run business days calculator in your browser tab.
Workday Calculator
Run workday calculator in your browser tab.
Age Calculator
Run age calculator in your browser tab.
Birthday Countdown
Run birthday countdown in your browser tab.
Anniversary Calculator
Run anniversary calculator in your browser tab.
Week Number Calculator
Run week number calculator in your browser tab.
Day of Year Calculator
Run day of year calculator in your browser tab.
Leap Year Checker
Run leap year checker in your browser tab.
Timezone Converter
Run timezone converter in your browser tab.
World Clock
Run world clock in your browser tab.
Meeting Time Planner
Run meeting time planner in your browser tab.
ISO Date Formatter
Run iso date formatter in your browser tab.
Duration Calculator
Run duration calculator in your browser tab.
Hours Calculator
Run hours calculator in your browser tab.
Timesheet Calculator
Run timesheet calculator in your browser tab.
Habit Streak Calculator
Run habit streak calculator in your browser tab.
Task Prioritization Matrix
Run task prioritization matrix in your browser tab.
Eisenhower Matrix
Run eisenhower matrix in your browser tab.
Daily Planner
Run daily planner in your browser tab.
Weekly Planner
Run weekly planner in your browser tab.
Monthly Planner
Run monthly planner in your browser tab.
Goal Breakdown Tool
Run goal breakdown tool in your browser tab.
Decision Matrix
Run decision matrix in your browser tab.
Weighted Scoring Matrix
Run weighted scoring matrix in your browser tab.
Random Picker
Run random picker in your browser tab.
Name Picker
Run name picker in your browser tab.
Team Generator
Run team generator in your browser tab.
Tournament Bracket Maker
Run tournament bracket maker in your browser tab.
Seating Chart Maker
Run seating chart maker in your browser tab.
Checklist Maker
Run checklist maker in your browser tab.
Packing List Generator
Run packing list generator in your browser tab.
Grocery List Generator
Run grocery list generator in your browser tab.
Study Schedule Maker
Run study schedule maker in your browser tab.
Birth Number Calculator
Run birth number calculator in your browser tab.
Life Path Number Calculator
Run life path number calculator in your browser tab.
Personal Year Number Calculator
Run personal year number calculator in your browser tab.