Time, Number & Color Converters

Convert Unix timestamps to dates, explain cron expressions, change number bases, and convert color codes with contrast ratios.

When to use these tools

Convert5 min read
Cron in GitHub Actions and Kubernetes: the UTC Pitfall
GitHub Actions runs cron schedules in UTC by default and Kubernetes uses the controller's time zone. Learn the 5-field syntax, time zone fields and the OR rule.
Updated 2026.10.03Related tool: Cron Expression Parser →
Convert5 min read
Unix Time: Seconds vs Milliseconds and the 2038 Problem
Unix time counts seconds since 1970 in UTC. Learn to tell seconds from milliseconds by digit count, handle time zones, and see what overflows in 2038.
Updated 2026.10.03Related tool: Unix Timestamp Converter →