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22 lines
765 B
Nix
22 lines
765 B
Nix
t: let
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rem = x: y: x - x / y * y;
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days = t / 86400;
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secondsInDay = rem t 86400;
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hours = secondsInDay / 3600;
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minutes = (rem secondsInDay 3600) / 60;
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# Courtesy of https://stackoverflow.com/a/32158604.
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z = days + 719468;
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era = (if z >= 0 then z else z - 146096) / 146097;
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doe = z - era * 146097;
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yoe = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365;
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y = yoe + era * 400;
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doy = doe - (365 * yoe + yoe / 4 - yoe / 100);
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mp = (5 * doy + 2) / 153;
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d = doy - (153 * mp + 2) / 5 + 1;
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m = mp + (if mp < 10 then 3 else -9);
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y' = y + (if m <= 2 then 1 else 0);
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pad = s: if builtins.stringLength s < 2 then "0" + s else s;
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in "${toString y'}-${pad (toString m)}-${pad (toString d)}-${pad (toString hours)}:${pad (toString minutes)}"
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