rzyfront/vendix-date-timezone
skills/vendix-date-timezone/SKILL.md
Date and timezone handling patterns: UTC-safe date-only display, form date strings, chart labels, date range queries, print formatting, and off-by-one day prevention. Trigger: When displaying dates, formatting date labels, using DatePipe/toLocaleDateString, querying date ranges, or adding DateTime fields.
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Last scanned: May 16, 2026, 5:05 AM147.1s1 file scanned
SKILL.md
- name:
- vendix-date-timezone
- description:
- >
- Date and timezone handling patterns:
- UTC-safe date-only display, form date strings,
- Trigger:
- When displaying dates, formatting date labels, using DatePipe/toLocaleDateString,
- license:
- MIT
- author:
- rzyfront
- version:
- 2.0
- scope:
- [root]
Vendix Date And Timezone
Core Problem
new Date('2026-04-12') is UTC midnight. In Colombia (UTC-5), local date formatting can show the previous day. Date-only backend values must be displayed in UTC.
Frontend Source of Truth
apps/frontend/src/app/shared/utils/date.util.ts exposes:
formatDateOnlyUTC(value)toLocalDateString(date?)toUTCDateString(date)getDefaultStartDate()getDefaultEndDate()formatChartPeriod(period, granularity)
Use these utilities for new code. Some legacy modules still use DatePipe or raw toLocaleDateString(); do not copy those patterns for date-only fields.
Rules
- Date-only fields: display with
timeZone: 'UTC'orformatDateOnlyUTC(). - Timestamp fields: local timezone is acceptable when showing time.
- Form date inputs should use
YYYY-MM-DDstrings. - Use
toLocalDateString()for local today defaults. - Use
toUTCDateString()when converting backend date-only values to input strings. - Use
formatChartPeriod()for chart labels instead of private component formatters. - Prefer
es-COfor Colombian-facing display, but keep existing utility behavior unless changing it intentionally;formatChartPeriod()currently uses localees.
Backend Rules
- Use UTC methods (
getUTCMonth,getUTCDate, etc.) for date math. - Be explicit when converting query strings into inclusive ranges.
- Do not assume one centralized backend parser exists everywhere; inspect the domain utility currently in use.
- Store timestamps as UTC; treat date-only business fields as midnight UTC values for display purposes.
Anti-Patterns
new Date(dateOnly).toLocaleDateString()without timezone.- Angular
DatePipefor date-only values without UTC handling. - Component-local date formatter duplication.
new Date('2026-04-12T00:00:00')withoutZwhen UTC was intended.
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vendix-angular-formsvendix-frontend-data-displayvendix-prisma-schema
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