Time & Date Calculators
Access free, interactive calculators for time & date. Click any tool to open the workspace on WebCalcSys.com.
8-Hour Shift
Calculate end of shift time.
Add Time
Add hours and minutes.
Age Difference
Calculate age difference.
Anniversary Calc
Days since anniversary.
Baby Age
Calculate baby age in months.
BC to AD
Years between BC and AD dates.
Birthday Countdown
Days until next birthday.
Business Days
Calculate business days.
Calendar Calc
What day a date falls on.
Chronological Age
Calculate exact age.
Date Calculator
Add/subtract days from date.
Date to Date
Days between two dates.
Day Counter
Count days between dates.
Day of Year
Find day number in year.
Every Second
What happens per second.
Hours Calculator
Calculate hours between times.
Hours & Minutes
Add hours and minutes.
Korean Age
Calculate Korean age.
Leap Year Check
Check if a year is a leap year.
Lunar Age
Calculate lunar age.
Minute Calculator
Calculate minutes between times.
Month Counter
Count months between dates.
Moon Phase
Estimate moon phase for date.
Palindrome Date
Check if date is palindrome.
Reverse Time
Find start time from end.
Sidereal Time
Estimate local sidereal time.
Subtract Time
Subtract time durations.
Time Calculator
Add or subtract time values.
Time Difference
Time difference between times.
Time Duration
Calculate duration.
Time to Decimal
Convert time to decimal hours.
Week Calculator
Weeks between dates.
Browse Other Calculator Categories
Explore calculation sheets and guides in other mathematical and scientific fields.