Standard Time & Date
20 toolsDays Between Dates Calculator
Calculate the exact number of days, weeks, and months between any two dates.
Add Days to Date Tool
Find the future date by adding a specified number of days, weeks, or months.
Subtract Days from Date Tool
Find the past date by subtracting a specified number of days, weeks, or months.
Time Duration Calculator
Calculate the duration between two times in hours, minutes, and seconds.
Add/Subtract Time Calculator
Add or subtract specific hours, minutes, and seconds to a baseline time.
Business Days Calculator
Determine the number of working days between dates, excluding weekends.
Business Days + Custom Holidays
Calculate business days factoring in custom national or corporate holidays.
Days Until Counter
Count down the precise days remaining until an upcoming event or deadline.
Days Since Counter
Track the days elapsed since a past historical event or life milestone.
Decimal Time Converter
Convert standard hours and minutes into decimal format and vice versa.
Leap Year Calculator
Check if any year is a leap year, list all leap years in a range, and see the calculation logic explained.
ISO Week Number Calculator
Find the ISO 8601 week number and year representation for any date.
Day of the Week Finder
Determine which day of the week a specific historical or future date falls on.
Time Percentage Calculator
Calculate how much of a day, week, month, or year has elapsed.
Date Midpoint Calculator
Find the exact midpoint date and time between two custom endpoints.
Millisecond Timer & Delta Counter
A precision timer showing elapsed milliseconds and delta gaps.
Day of the Year Ordinal Converter
Convert any date to its ordinal day of the year (1-366) and vice versa.
Working Hours Tracker
Log and calculate the sum of working hours across customized date ranges.
Overtime Hours Calculator
Calculate regular and overtime working hours based on daily or weekly thresholds.
Payroll Period Planner
Generate and review dates for standard weekly, bi-weekly, or monthly pay cycles.
HR, Payroll & Freelance
21 toolsTime Card Calculator
Calculate daily and weekly hours worked from clock-in/clock-out timestamps.
Multi-Break Time Card Tool
Generate work timecards factoring in multiple unpaid lunch and rest breaks.
Overtime Pay Calculator
Compute gross pay including regular and time-and-a-half (1.5x) or double-time (2x) hours.
Hourly to Salary Converter
Convert an hourly wage into equivalent weekly, monthly, and annual salaries.
Salary to Hourly Calculator
Divide annual salary into equivalent hourly rates for different work structures.
Freelance Project Capacity Planner
Estimate available billable hours based on client commitments and personal limits.
PTO Accrual Calculator
Calculate accumulated Paid Time Off (PTO) based on pay periods and accrual rates.
Furlough Pay Calculator
Calculate the monthly and total financial impact of unpaid leaves, furlough days, or temporary work suspensions.
Shift Differential Calculator
Calculate night shift pay, differential rates, and overtime instantly. Supports flat-rate and percentage premiums for any industry.
Gross-to-Net Time Pay Sheet
Estimate net take-home pay after standard hours, taxes, and voluntary deductions.
Billable Hours Tracker
Log hours, associate them with clients/rates, and prepare invoice-ready summaries.
Commission Per Hour Calculator
Convert sales commissions into hourly rate equivalents and evaluate combined compensation structures.
Daily Break Deductor Tool
Automatically subtract mandatory breaks from logged total timesheet intervals.
Annual Work Hours Counter
Determine the exact work hours in a full calendar year excluding selected holidays.
Multi-Job Income Sync Clocks
Track overlapping timesheets and total concurrent income from multiple jobs.
Free Biweekly Timesheet Calculator
Generate a detailed 14-day biweekly timesheet with daily hours, overtime tracking, and payroll subtotals.
Semi Monthly Pay Calculator
Calculate gross pay per period for twice-a-month schedules. Convert annual salary to semi-monthly paychecks instantly.
Retainer Hours Tracker Online
Track hours consumed vs. remaining balance for monthly retainer clients, projecting burn rates and depletion dates.
Time-Weighted Employee Utility Tracker
Monitor relative labor cost compared to project milestones and logged hours.
Fractional Work Hours Allocator
Allocate weekly hours and revenues across multiple fractional clients, track capacity utilization, and model income scenarios.
Employee Utilization Calculator
Calculate employee utilization rates, billable vs. non-billable hours, and revenue efficiency across teams.
Project Management & Business
20 toolsProject Deadline Back-Planner
Work backward from a deadline to calculate start dates and milestones, incorporating buffer and weekend rules.
Gantt Chart Date Calculator
Map out project tasks with durations and dependencies to calculate start/end dates and visualize overlap.
Agile Sprint Date Calculator
Plan sprint start and end dates, ceremonies, and milestones for any sprint length.
SLA Timer
Track time remaining before a service level agreement deadline is breached, with visual countdown and breach alerts.
Lead Time & Cycle Time Calculator
Track and calculate manufacturing, software development, or service delivery lead times and process efficiency.
Statutory Notice Period Calculator
Determine required resignation or termination notice periods and project final employment dates.
Subscription Renewal & Runway Calculator
Track subscription payment intervals (monthly/annual) and project cash runway based on recurring costs.
Event Back-Timer & Milestone Planner
Plan hour-by-hour schedules backward from event start times, including setup, presentations, and breaks.
Fiscal Quarter Calculator
Find Q1-Q4 start and end dates for any fiscal year, including non-standard fiscal years that start in months other than January.
Project Buffer Calculator
Calculate the schedule buffer needed to protect your project deadline based on task risks and dependencies.
Document Expiration Date Calculator
Calculate document disposal and archiving dates based on creation dates and regulatory compliance periods.
Downtime & Service Uptime Calculator
Calculate overall service uptime percentage and review total downtime durations from incident logs.
RRule Generator Online
Generate standard RFC 5545 iCalendar Recurrence Rules (RRule) and preview upcoming occurrence dates.
Invoice Due Date & Aging Calculator
Calculate payment deadlines based on issue date and net terms, and track overdue aging buckets.
Free Legal Deadline Calculator
Calculate legal filing deadlines, accounting for business days, court holidays, and weekend rules — completely free.
Delivery Slip Risk Calculator
Evaluate project delivery risk and slip probability by tracking velocity against target completion dates.
Pomodoro Session & Break Segmenter
Structure workdays into custom Pomodoro blocks (focus/break segments) and project completion times.
Remote Team Time Zone Overlap Finder
Find overlapping work hours and optimal meeting times for distributed teams across multiple time zones.
Critical Path Calculator
Find the critical path, float, and project duration for any network of tasks. Works for AON and AOA methods.
Campaign Deployment Timeline Planner
Map marketing phases (content, design, ads) backward from launch date and assign operational channels.
Global Time & Time Zones
20 toolsWorld Time Zone Converter
Convert a custom time in one city to multiple global destinations simultaneously.
World Clock Meeting Planner
Find the best meeting time for teams in different time zones with a visual working-hours overlap grid.
UTC/GMT Offset Finder
Identify current offsets and UTC/GMT representations for standard time zones.
Military Time Converter
Convert between 12-hour AM/PM formats and 24-hour military standards.
Daylight Saving Time Transition Tracker
See upcoming DST clock shift dates and impact changes across regions.
Flight Duration & Time Zone Calculator
Determine flight duration using departure/arrival local times and airports.
Time Zone Finder by Map Click
Interactive visual coordinate mapping showing global time zones.
Unix Timestamp Converter
Convert epoch timestamps in seconds or milliseconds to human-readable dates.
International Date Line Crossing Simulator
Simulate traveling across the Pacific IDL to see date changes in real time.
Time Zone Abbreviation Directory
Look up standard abbreviations like EST, CEST, JST, and AEDT with active offsets.
Zulu Time Converter
Convert local time to Zulu (UTC) time instantly. Built for pilots, military personnel, and aviation professionals.
Swatch Time Converter
Convert standard time to Swatch Internet Time .beats and back — the quirky 1990s universal time format.
GPS Time Converter
Convert GPS time to UTC, Unix time, or local time. Handles leap seconds and GPS week rollover.
Multi-City Desktop Grid Clock
Pin multiple active clocks to a customized grid to watch live timezones.
Cross-Border Deadline Calculator
Calculate legal filing deadlines across multiple jurisdictions with time zone and holiday support.
Time Zone Relative Difference Grid
View a visual matrix showing offsets relative to your own timezone.
Solar Time vs Standard Time Tracker
Compare solar tracking time to standard legal timezone representations.
NTP Time Tester Online
Check NTP server accuracy, measure time offset, and compare your system clock against network time.
Leap Second History Log
Browse historical logs of leap seconds introduced into standard UTC time.
True Solar Noon Precision Tracker
Calculate exact daily solar noon coordinates based on GPS coordinates.
Health & Lifecycle
20 toolsPregnancy Due Date Calculator
Calculate expected delivery date based on LMP, conception date, or IVF transfer.
Trimester Milestone Calendar
Generate a timeline detailing pregnancy weeks, development stages, and milestones.
Age Calculator (Down to the Second)
See your age in years, months, days, minutes, and running seconds.
Circadian Rhythm Sleep Calculator
Calculate optimal times to sleep or wake up based on natural 90-minute sleep cycles.
Ovulation & Fertility Window Map
Track your cycle to find estimated ovulation dates and fertile windows.
Intermittent Fasting Schedule Planner
Plan and track daily fasting intervals (e.g., 16:8, 18:6, or custom routines).
Medication Interval Scheduler
Generate structured intake reminders based on hourly intervals or daily dosages.
Habit Streak Milestone Planner
Chart timeline targets (e.g., 21 days, 66 days) to form solid routines.
Pet Age Translator
Convert dog, cat, or bird years to human years based on size and species guidelines.
Caffeine Elimination Curve Tool
Graph the decline of caffeine levels in your body based on typical half-life models.
Alcohol Metabolism Clearance Clock
Estimate approximate time required for your system to metabolize alcohol intake.
Nicotine Detox Health Timeline
Track physical recovery stages starting from the first hour of quitting smoking/vaping.
Shift Work Sleep Adjuster
Plan melatonin and sleep adjustments when transitioning to night shifts.
Vaccination Tracker Timeline
Chart pediatric or travel immunization schedules based on age milestones.
Screen Time Break Timer
Set alerts reminding you of the 20-20-20 rule to prevent digital eye strain.
Loan Maturity Date Calculator
Identify final payoff dates based on loan duration and initial start dates.
Interest Day-Count Calculator
Calculate accrued interest using Standard Actual/360, Actual/365, or 30/360 rules.
Statutory Tenancy Notice Planner
Find legal dates for giving notice to terminate standard residential lease periods.
Golden Hour & Blue Hour Tracker
Identify exact daily photography lighting windows based on geographical position.
Perpetual Wall Calendar Blueprint
Examine dates in any historical year from 1 AD to 9999 AD.