From f9a77c5c27aede4e5978eb55d9b7af781b680a1d Mon Sep 17 00:00:00 2001
From: João Augusto Costa Branco Marado Torres <torres.dev@disroot.org>
Date: Tue, 24 Jun 2025 12:08:41 -0300
Subject: feat!: initial commit
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Signed-off-by: João Augusto Costa Branco Marado Torres <torres.dev@disroot.org>
---
 src/utils/datetime.ts | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 src/utils/datetime.ts

(limited to 'src/utils/datetime.ts')

diff --git a/src/utils/datetime.ts b/src/utils/datetime.ts
new file mode 100644
index 0000000..3a2cd25
--- /dev/null
+++ b/src/utils/datetime.ts
@@ -0,0 +1,43 @@
+export function toIso8601Full(date: Date): string {
+  const yearN = date.getFullYear();
+  const isNegativeYear = yearN <= 0;
+  const year = isNegativeYear ? pad(1 - yearN, 6) : pad(yearN, 6);
+  const signedYear = (isNegativeYear ? "-" : "+") + year;
+
+  const month = pad(date.getMonth() + 1);
+  const day = pad(date.getDate());
+  const hour = pad(date.getHours());
+  const minute = pad(date.getMinutes());
+  const second = pad(date.getSeconds());
+  const ms = pad(date.getMilliseconds(), 3);
+
+  const dateString =
+    `${signedYear}-${month}-${day}T${hour}:${minute}:${second}.${ms}`;
+  const tzOffset = -date.getTimezoneOffset();
+  if (tzOffset === 0) {
+    return `${dateString}Z`;
+  } else {
+    const offsetSign = tzOffset > 0 ? "+" : "-";
+    const offsetHours = pad(Math.floor(Math.abs(tzOffset) / 60));
+    const offsetMinutes = pad(Math.abs(tzOffset) % 60);
+    return `${dateString}${offsetSign}${offsetHours}:${offsetMinutes}`;
+  }
+}
+
+export function toIso8601FullUTC(date: Date): string {
+  const yearN = date.getUTCFullYear();
+  const isNegativeYear = yearN <= 0;
+  const year = isNegativeYear ? pad(1 - yearN, 6) : pad(yearN, 6);
+  const signedYear = (isNegativeYear ? "-" : "+") + year;
+
+  const month = pad(date.getUTCMonth() + 1);
+  const day = pad(date.getUTCDate());
+  const hour = pad(date.getUTCHours());
+  const minute = pad(date.getUTCMinutes());
+  const second = pad(date.getUTCSeconds());
+  const ms = pad(date.getUTCMilliseconds(), 3);
+
+  return `${signedYear}-${month}-${day}T${hour}:${minute}:${second}.${ms}Z`;
+}
+
+const pad = (num: number, len = 2) => String(Math.abs(num)).padStart(len, "0");
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