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Fix adding months to date that ends in dec following year

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Jesse Gumm 2017-09-29 15:18:02 -05:00
parent fc247e296b
commit bab222aeb4
1 changed files with 4 additions and 0 deletions
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4
src/qdate.erl
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@ -692,6 +692,9 @@ fix_maybe_improper_date({Date0, Time}) ->
Date = fmid(Date0),
{Date, Time}.
fix_year_month({Y, M}) when M > 12, M rem 12==0 ->
YearsOver = (M div 12) - 1,
{Y + YearsOver, 12};
fix_year_month({Y, M}) when M > 12 ->
YearsOver = M div 12,
{Y + YearsOver, M-(YearsOver*12)};
@ -1275,6 +1278,7 @@ arith_tests(_) ->
?_assertEqual({{2015,2,28},{0,0,0}}, to_date(add_months(2, {{2014,12,31},{0,0,0}}))),
?_assertEqual({{2016,2,28},{0,0,0}}, to_date(add_years(1, {{2015,2,28},{0,0,0}}))),
?_assertEqual({{2014,2,28},{0,0,0}}, to_date(add_months(-24, {{2016,2,29},{0,0,0}}))),
?_assertEqual({{2018,12,15},{0,0,0}}, to_date(add_months(24, {{2016,12,15},{0,0,0}}))),
?_assertEqual({{2012,2,29},{0,0,0}}, to_date(add_months(-48, {{2016,2,29},{0,0,0}}))),
?_assertEqual({{2016,2,29},{0,0,0}}, to_date(add_months(-1, {{2016,3,31},{0,0,0}}))),
?_assertEqual({{2017,2,28},{0,0,0}}, to_date(add_years(1, {{2016,2,29},{0,0,0}}))),