samples/iyi/std_time.iyi

# Demonstrates `std/time`: wall clock, monotonic stopwatch, civil calendar, and RFC 3339.
#
# Run via:
#     ./bin/iyi run samples/iyi/std_time.iyi

module samples/std_time

import std/time::{Time, Span}

# 1. Fixed reference date demonstration
ref_time = Time.utc(2024, 2, 29, 12, 30, 45, 123)
puts "Reference time (UTC): #{ref_time.to_s}"
puts "RFC 3339:             #{ref_time.to_rfc3339(3)}"
puts "Unix timestamp:       #{ref_time.to_unix} s (#{ref_time.to_unix_ms} ms)"

# 2. Civil calendar components
puts "Year:                 #{ref_time.year}"
puts "Month:                #{ref_time.month}"
puts "Day:                  #{ref_time.day}"
puts "Day of week:          #{ref_time.day_of_week.to_s}"
puts "Day of year:          #{ref_time.day_of_year}"

# 3. Time arithmetic with Span
one_day = Span.days(1_i64)
tomorrow = ref_time + one_day
yesterday = ref_time - one_day
puts "Tomorrow:             #{tomorrow.to_rfc3339}"
puts "Yesterday:            #{yesterday.to_rfc3339}"

# 4. Live clock queries (wall clock and monotonic stopwatch)
now = Time.utc
puts "Live wall clock valid: #{now.year >= 2024}"

start = Time.monotonic
# Burn a few cycles to measure elapsed duration
acc = 0_i64
i = 0
while i < 100000
  acc = acc + i.to_i64
  i = i + 1
end
elapsed = Time.monotonic - start
puts "Monotonic duration >= 0: #{elapsed.total_seconds >= 0.0}"

# 5. Parsing RFC 3339 strings
event = Time.parse_rfc3339("2024-02-29T12:00:00Z")
puts "Leap day event:       #{event.to_s}"
puts "Is leap year:         #{Time.leap_year?(event.year)}"