All online calculators

  • Cylinder
  • Cylindrical tank volume

    Cylindrical tank volume

  • Date and interval

    Adds and subtracts a specified time interval to the specified date

  • Date and number of working days (for Russia)

    Calculator calculates the date of the initial date and the number of working days. Taking into account weekends, holidays and weekend shifts at work days, according to the published decrees of the government of the Russian Federation. Created by user's request.

  • Date plus days

    This online calculator adds or subtracts given number of days to or from the given date.

Date by the Julian Day Number

Displays Gregorian calendar date corresponding to Julian Day Number


Date by the Julian Day Number

  • Date to timestamp converter

    This calculator converts date to epoch timestamp in milliseconds, that is, milliseconds since standard epoch of 1/1/1970, as used, for example, in Javascript.

  • Days between dates. The historical version.

    Calculates number of days between two dates taking in account the date of transition to Gregorian calendar.

  • Days count in several date spans

    The calculator gives total number of days in date span list. Each date span is defined by start date and end date. The calculator can exclude multiple date date span intersections.

  • Density of oil

    Recalculation of density of oil for different temperature and pressure values. Formulas are taken from Russia's GOST R 8.610-2004. "State system for ensuring the uniformity of measurements. Density of oil. The tables for recalculation" standard

  • Derivative

    It finds one variable function derivative. Step by step differentiation solution is also provided.

Day of week by date

This online calculator outputs day of week for given date


Day of week by Date