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====== Перевод времени в формате Unix в привычную дату-время ======
{{tag>Заметки Unix Timestamp}}
===== Алгоритм =====

(найдено на зарубежном ресурсе)

>Ok, I managed to get something accurate. Dang leap years!
>
>In the steps below I am using a timestamp of 1203161493 which corresponds to a date/time of 2-15-2008 11:31:33. I'm ignoring timezones and whatnot, it isn't necessary for this.
>
>Steps:
>1. Unix timestamp / hours in a year to get years from 1970 to timestamp
>>ex: 1203161493 / 31436000 = 38.152... years since 1970. Ignoring the decimals, thats 38 years + 1970 = 2008. 
>
>2. Determine number of leap years from 1970 to year found in step 1 (extra days).
>ex: (2008-1969)/4 = 9.75. Again, ignore the decimal, and we have 9 extra days (we ignore this year's leap day until later)
>
>3. Determine the number of days since the epoch.
>ex: 1203161493 / 86400 = 13925.480... days since epoch. Ignore the decimals again.
>
>4. Subtract leap days from number of days since epoch.
>ex: 13925 - 9 = 13916.
>
>5. Modulo the number above by the number of days in a year to find the days passed in the current year.
>ex: 13916 % 365 = 46 days this year.
>
>6. We go through each month and subtract it until the days left are less than the month's total days. If this year is a leap year and your days in this year found in step 5 was greater than 59 (31+28), we would add one. 
>ex: 46 - 31 days in Jan = 15 days (in 2nd month) = Feb 15.
>
>6. Find the number of seconds in the current day. Subtract the days since epoch found in step 3 from the timestamp.
>ex: 1203161493 - (13925 * 86400) = 41493 seconds
>
>7. Figure out how many hours the seconds found in step 6 is.
>ex: 41493 / 3600 = 11.5283... hours. Ignore the decimal again.
>
>8. Find the number of minutes left. Subtract the hours you found in the previous step from the seconds in step 6, then divide by 60.
>ex: 41493 - (11 * 3600) = 1893
>1893 / 60 = 31.55 minutes. Ignore the decimal
>
>9. Find the number of seconds left. Subtract the minutes in step 8 from the seconds in step 8
>ex: 1893 - (31 * 60) = 33 seconds.
>
>Put it all together:
>Year: 2008
>Month: 2
>Day: 15
>Hour: 11
>Minute: 31
>Second: 33


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===== Дополнительно =====
==== Полезные ссылки на эту тему ====
  * [[http://we.easyelectronics.ru/Soft/konvertaciya-vremeni.html|Конвертация времени]]
  * [[http://we.easyelectronics.ru/Soft/funkcii-kalendarya-i-vremeni-na-odnom-registre.html|Функции календаря и времени на одном регистре]]
  * [[https://ru.wikipedia.org/wiki/%D0%AE%D0%BB%D0%B8%D0%B0%D0%BD%D1%81%D0%BA%D0%B0%D1%8F_%D0%B4%D0%B0%D1%82%D0%B0|Читаем про преобразование дат]]

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