fix(android): Avoid Math floor APIs

[adinauer]

📜 Description

Replace Math.floorDiv and Math.floorMod usage in SentryIso8601Utils with a package-private SentryMath helper.

💡 Motivation and Context

Fixes #5741

SentryIso8601Utils lives in the shared sentry module and is reachable from Android. Android supports minSdk 21 in this repo, but java.lang.Math.floorDiv/floorMod are only available on newer Android API levels. Calling them from shared code can crash Android apps on supported older devices with NoSuchMethodError.

The replacement helper adapts Apache-licensed Guava LongMath floor division logic and adds matching attribution in THIRD_PARTY_NOTICES.md. floorMod is implemented through floorDiv so it matches Java Math.floorMod for both positive and negative divisors.

💚 How did you test it?

• ./gradlew :sentry:test --tests "io.sentry.vendor.SentryMathTest" --tests "io.sentry.DateUtilsTest"
• ./gradlew :sentry:animalsnifferMain
• ./gradlew spotlessApply apiDump
• rg -n "\\bMath\\.(floorDiv|floorMod)" sentry/src/main/java sentry-android-core/src/main/java -g '*.java' -g '*.kt'

📝 Checklist

• I added GH Issue ID & Linear ID
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

None.

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.47.0 (1)	release

⚙️ sentry-android Build Distribution Settings

[runningcode]

We should def add a test for this.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	316.75 ms	357.76 ms	41.01 ms
Size	0 B	0 B	0 B

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
4c04bb8	350.71 ms	413.63 ms	62.92 ms
bb0ff41	315.84 ms	350.76 ms	34.92 ms
7c1a728	289.46 ms	368.15 ms	78.69 ms
ff8eea4	313.42 ms	337.08 ms	23.66 ms
bbc35bb	298.53 ms	372.17 ms	73.64 ms
91bb874	311.00 ms	363.47 ms	52.47 ms
abfcc92	337.38 ms	427.39 ms	90.00 ms
ae7fed0	293.84 ms	380.22 ms	86.38 ms
3998a95	415.94 ms	478.54 ms	62.60 ms
d15471f	307.28 ms	381.85 ms	74.57 ms

App size

Revision	Plain	With Sentry	Diff
4c04bb8	0 B	0 B	0 B
bb0ff41	0 B	0 B	0 B
7c1a728	0 B	0 B	0 B
ff8eea4	1.58 MiB	2.28 MiB	718.64 KiB
bbc35bb	1.58 MiB	2.12 MiB	553.01 KiB
91bb874	1.58 MiB	2.13 MiB	559.07 KiB
abfcc92	1.58 MiB	2.13 MiB	557.31 KiB
ae7fed0	1.58 MiB	2.12 MiB	551.77 KiB
3998a95	1.58 MiB	2.10 MiB	532.96 KiB
d15471f	1.58 MiB	2.13 MiB	559.54 KiB

Previous results on branch: fix/android-floor-div

Startup times

Revision	Plain	With Sentry	Diff
d888d1b	335.53 ms	412.98 ms	77.45 ms

App size

Revision	Plain	With Sentry	Diff
d888d1b	0 B	0 B	0 B

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit b5c0278. Configure here.}