Time Conversion Calculators

Date and Time Formats

Date and time formats are vital in computer systems, but it is an area of remarkable shortsightedness. Y2K caused little disruption, but only because of a huge investment in reprogramming (estimates vary but on the order of $20B). The POSIX time system, used in Unix systems and embedded in countless applications will overflow in 2038.Embedded systems often require accurate, high-resolution time-keeping and are difficult or impossible to revise after deployment.Date/time formats are a tradeoff between three specifications: The required range of the time (underestimated in the examples above), the required resolution of the time and the resulting number of bits.Below you will find a number of standard date/time formats for comparison. Edit one of the fields below and click "Calculate" to change all of the fields.

We are in the process of redesigning our calculators. The below calculators are coming soon. Check back with us!
  • Current Time
  • GMT (Greenwich Mean Time)
  • Arbitrary time zone
  • ISO8601
  • POSIX or "Unix time"
  • Javascript format
  • MS Windows'
  • Julian Date
  • Analog Clock