Find auspicious days (ngay hoang dao / ngay tot) in the next N days for a specific activity: wedding, moving house, opening business, signing contracts, groundbreaking, travel, renovation and more. Returns matching dates with lunar date, Can Chi and what each day is good for. The classic Vietnamese 'xem ngay tot' as an API.

Convert between solar (Gregorian) and Vietnamese/Chinese lunar dates, both directions, 1900-2100, with leap month support. Returns Can Chi of the day. Essential for birthday lookup, ancestor worship dates (ngay gio) and traditional holidays.

Vietnamese lunar calendar for ANY solar date (1900-2100): lunar date, Can Chi in Vietnamese, hoang dao / hac dao quality, good-for and bad-for activities, auspicious hours and solar term. Use for planning events, birthdays (am lich), anniversaries and BaZi context.

Vietnamese lunar calendar for TODAY (Asia/Ho_Chi_Minh): lunar date, Can Chi (heavenly stems & earthly branches in Vietnamese), hoang dao / hac dao day quality, activities the day is good for and bad for (wedding, moving, opening business...), auspicious hours (gio hoang dao) and solar term. Changes every day — perfect for daily briefing bots and horoscope agents serving Vietnamese users.