/**
* Date Parser Service
* Handles parsing of date inputs:
* - "today", "yesterday"
* - Specific dates: "2024-10-11", "10/11/2024", "11.10.2024"
*/
export interface ParsedDate {
date: Date;
displayName: string;
}
export class DateParser {
/**
* Parse a date string into a Date object
*/
static parse(input: string): ParsedDate {
const normalized = input.toLowerCase().trim();
// Handle "today"
if (normalized === 'today') {
const today = new Date();
today.setHours(0, 0, 0, 0);
return { date: today, displayName: 'today' };
}
// Handle "yesterday"
if (normalized === 'yesterday') {
const yesterday = new Date();
yesterday.setDate(yesterday.getDate() - 1);
yesterday.setHours(0, 0, 0, 0);
return { date: yesterday, displayName: 'yesterday' };
}
// Handle specific date formats (YYYY-MM-DD, MM/DD/YYYY, etc.)
const parsedDate = this.parseSpecificDate(normalized);
if (parsedDate) {
return { date: parsedDate, displayName: this.formatDate(parsedDate) };
}
throw new Error(
`Unable to parse date: "${input}". Supported formats: ` +
`"today", "yesterday", or specific dates (e.g., "2024-10-11", "10/11/2024")`
);
}
/**
* Parse specific date formats
*/
private static parseSpecificDate(input: string): Date | null {
// Try YYYY-MM-DD format
const dashFormat = input.match(/^(\d{4})-(\d{1,2})-(\d{1,2})$/);
if (dashFormat) {
const [, year, month, day] = dashFormat;
const date = new Date(parseInt(year), parseInt(month) - 1, parseInt(day));
date.setHours(0, 0, 0, 0);
if (!isNaN(date.getTime())) return date;
}
// Try MM/DD/YYYY format
const slashFormat = input.match(/^(\d{1,2})\/(\d{1,2})\/(\d{4})$/);
if (slashFormat) {
const [, month, day, year] = slashFormat;
const date = new Date(parseInt(year), parseInt(month) - 1, parseInt(day));
date.setHours(0, 0, 0, 0);
if (!isNaN(date.getTime())) return date;
}
// Try DD.MM.YYYY format
const dotFormat = input.match(/^(\d{1,2})\.(\d{1,2})\.(\d{4})$/);
if (dotFormat) {
const [, day, month, year] = dotFormat;
const date = new Date(parseInt(year), parseInt(month) - 1, parseInt(day));
date.setHours(0, 0, 0, 0);
if (!isNaN(date.getTime())) return date;
}
return null;
}
/**
* Format a date to YYYY-MM-DD for display (using local timezone)
*/
private static formatDate(date: Date): string {
const year = date.getFullYear();
const month = String(date.getMonth() + 1).padStart(2, '0');
const day = String(date.getDate()).padStart(2, '0');
return `${year}-${month}-${day}`;
}
/**
* Get the end of day for a given date (23:59:59.999)
*/
static getEndOfDay(date: Date): Date {
const end = new Date(date);
end.setHours(23, 59, 59, 999);
return end;
}
/**
* Format a date to ISO string for git queries
*/
static toISOString(date: Date): string {
return date.toISOString();
}
}
