veloren/nix/dateTimeFormat.nix
2022-09-03 16:00:11 +03:00

22 lines
765 B
Nix

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