`date-fns` or `moment` timezone conversion uses fixed UTC offset

[Junman140]

src/utils/dateUtils.ts: Date formatting may use a hardcoded offset or Date.toISOString() without considering the user's actual timezone preference. Business-day calculations for salary runs and withdrawal delays are off by one day in edge timezones.

[Banx17]

@Banx17 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Good day Team, I would love to work with you on this issue, please kindly assign thanks.

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[drips-wave]

Congratulations, @Banx17! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @Banx17: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@Banx17's PR #543 was approved and merged by @Junman140.

🏆 @Banx17: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (401 total points). Track your full progress on GrantFox.

👏 Great work, @Banx17! Keep contributing to Pi-Defi-world.

[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @Banx17 as part of the Stellar Wave Program's 6th Wave 🥳

Moderator's reason: [Auto-assessed] PR #543 successfully addresses the issue by implementing a robust IANA-aware timezone utility and updating all relevant business logic (savings, investments, salary runs) to use it. The PR was merged by the issue creator, and although the GitHub issue remains open, it is clearly completed.

😎 @Banx17: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.

ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.