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timecalc

Calculator for converting between units of time as well as some simple arithmetic operations

Capabilities

Arithmetic operations

  • addition
  • subtraction

Units

  • seconds
  • milliseconds
  • microseconds
  • nanoseconds

The different mappings of text to unit can be seen in parse_time_unit in src/parse.rs.

Unit conversions

Units are left-associative so the output will be the same unit as the left-most unit. Output can be explicitly set to a given unit by writing as <time_unit> at the end of an expression.

Resolution is at the nanosecond range and output is floating point. format!()'s default behavior for floating point values works well enough for this use-case.

$ tcalc 1 us - 750 ns
Result: 0.25us

Install locally with cargo

cargo install --path .
# For most environments, installs to ~/.cargo/bin/tcalc

Example usage

Adding two different units of time

$ tcalc 2000us + 1000ns
Result: 2001us

Change unit of output

$ tcalc 2000ms - 150ms as us
Result: 1850000us

Expressions with more than two operands and fractions

$ tcalc 1sec - 0.5sec + 250ms
Result: 0.75sec