[BUG]: Dates in financial documents should be absolute or explicitly timezoned.

[aniket866]

Bug Description

• Where? InvoicePreview.jsx

- Issue new Date(invoice.issueDate) without timezone handling.

• Fix Use date-fns or dayjs with UTC.

• Why? An invoice issued on "Feb 20" in India might show as "Feb 19" in New York. Dates in financial documents should be absolute or explicitly timezoned.

Steps to Reproduce

N/A

Logs and Screenshots

N/A

Environment Details

N/A

Impact

Critical - Application is unusable

Code of Conduct

• I have joined the Discord server and will post updates there
• I have searched existing issues to avoid duplicates

[sach2004]

@DengreSarthak @kumawatkaran523 it is a valid issue. dates are stored as full timestamps so toLocaleDateString() can show a different date depending on viewers timezone. should just store as plain date strings instead.