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Improve accuracy of date subtraction.

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voussoir 2021-01-15 23:44:08 -08:00
parent 478305b8fe
commit 98d1b26429
1 changed files with 10 additions and 1 deletions
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11
voussoir.net/eternalseptember/eternalseptember.js
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@ -36,6 +36,15 @@ eternalseptember.MONTH_NAMES = [
"December",
]
eternalseptember.date_subtract =
function date_subtract(now, then)
{
now = Date.UTC(now.getFullYear(), now.getMonth(), now.getDate());
then = Date.UTC(then.getFullYear(), then.getMonth(), then.getDate());
return Math.floor((now - then) / (1000*60*60*24));
}
eternalseptember.twelvehour =
function twelvehour(hour)
{
@ -51,7 +60,7 @@ eternalseptember.strftime =
function strftime(date, format)
{
const diff = date - eternalseptember.EPOCH;
const diff_days = parseInt(diff / (1000*60*60*24));
const diff_days = eternalseptember.date_subtract(date, eternalseptember.EPOCH);
const day_of_month = diff_days + 1
const day_of_year = diff_days + 244