Calcdate is a command-line utility written in Go that performs basic date operations and calculations, particularly useful for generating date ranges for database queries. It allows users to manipulate dates with relative offsets, work with time intervals, and format dates in various ways.

High-performance, zero-allocation .NET library for mathematical intervals and ranges. Features type-safe range operations (intersection, union, contains, overlaps), first-class infinity support, span-based parsing, and zero-allocation interpolated string parsing. Built with modern C# using structs, spans, and records for optimal performance.