Date & Time
Date and time tools cover calendar arithmetic (date differences, adding days, business days), clock-time duration and decimal-hour conversion, and fixed UTC offset conversion. Related tools such as the Date Difference Calculator, Add Days to Date and Business Days Calculator link together for common scheduling tasks.
Date Difference Calculator
Find calendar years, months, days and total days between two dates.
+DAYAdd Days to Date
Add or subtract a number of calendar days from a chosen date.
BIZBusiness Days Calculator
Count weekdays between two dates while excluding Saturdays and Sundays.
TIMETime Duration Calculator
Find elapsed hours and minutes between two clock times.
H→DHours & Minutes to Decimal
Convert hours and minutes into decimal hours.
D→HDecimal Hours to Time
Convert decimal hours into hours and minutes.
WEEKWeek Number Calculator
Find the ISO week number and ISO week-year for a date.
DOYDay of Year Calculator
Find a date’s ordinal day number within its year.
WORKWork Hours Calculator
Calculate paid work duration from start, end and unpaid break time.
UTCTime Zone Offset Converter
Convert a date and time between two fixed UTC offsets.