datetime_utility.ruff

// Date/Time Utility
// Demonstrates date/time functions from stdlib

print("=== Date/Time Utility ===")
print("")

// Current timestamp
timestamp := now()
print("Current Unix Timestamp: " + timestamp)
print("")

// Format current date/time in various ways
print("Formatted Date/Time:")
print("  ISO Format:       " + format_date(timestamp, "YYYY-MM-DD"))
print("  US Format:        " + format_date(timestamp, "MM/DD/YYYY"))
print("  European Format:  " + format_date(timestamp, "DD/MM/YYYY"))
print("  Full DateTime:    " + format_date(timestamp, "YYYY-MM-DD HH:mm:ss"))
print("  Time Only:        " + format_date(timestamp, "HH:mm:ss"))
print("")

// Historical dates
print("Historical Dates:")
moon_landing := parse_date("1969-07-20", "YYYY-MM-DD")
print("  Moon Landing:     " + format_date(moon_landing, "YYYY-MM-DD") + " (" + moon_landing + ")")

independence := parse_date("1776-07-04", "YYYY-MM-DD")
print("  US Independence:  " + format_date(independence, "YYYY-MM-DD") + " (" + independence + ")")

millennium := parse_date("2000-01-01", "YYYY-MM-DD")
print("  Y2K Millennium:   " + format_date(millennium, "YYYY-MM-DD") + " (" + millennium + ")")
print("")

// Date calculations
print("Date Calculations:")
today := now()
week_ago := today - (7 * 24 * 60 * 60)  // 7 days in seconds
print("  Today:            " + format_date(today, "YYYY-MM-DD"))
print("  Week Ago:         " + format_date(week_ago, "YYYY-MM-DD"))

month_future := today + (30 * 24 * 60 * 60)  // ~30 days in seconds
print("  ~30 Days Later:   " + format_date(month_future, "YYYY-MM-DD"))
print("")

// Age calculator
print("Age Calculator:")
birth_date := parse_date("1990-05-15", "YYYY-MM-DD")
age_seconds := today - birth_date
age_days := age_seconds / (24 * 60 * 60)
age_years := age_days / 365.25
print("  Birth Date:       " + format_date(birth_date, "YYYY-MM-DD"))
print("  Age (approx):     " + floor(age_years) + " years")
print("  Days Lived:       " + floor(age_days) + " days")