This example shows how to parse the output of uptime on Unix and determine when the system booted. This demonstrates regex parsing, fallible construction of spans, zone aware arithmetic and rounding.

To run this program, use:

$ uptime | cargo run -qp uptime
2024-06-28T08:08:00-04:00[America/New_York]

If you don't have uptime, then you can pipe in data that looks like it came from uptime:

$ echo '14:00:47 up 12 days,  5:53' | cargo run -qp uptime
2024-06-28T08:08:00-04:00[America/New_York]