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Time arithmetic works in base 60 for minutes and seconds. To add times: add minutes, carry 60-minute groups to hours. Duration calculation crosses midnight if the end is earlier than start (add 24 hours to the end time). Convert decimal hours to H:MM by multiplying the decimal by 60. Time zones: UTC offsets range from UTC−12 to UTC+14. Daylight saving transitions add/remove one hour.
Elapsed
2 days, 6 hours, 30 minutes, 0 seconds
Total: 196,200 seconds