Below is the converted calendar dates from Gregorian and Hijri calendars. To convert other dates, select from the dropdown menu and click the Convert button.
| Feature | Gregorian | Hijri |
|---|---|---|
| Type | Solar | Lunar |
| Year Length | 365 or 366 days | 354 or 355 days |
| Month Length | 28–31 days | 29 or 30 days |
| Basis | Earth's orbit around the Sun | Moon's orbit around the Earth |
The Gregorian calendar is the international standard. The Hijri calendar is lunar-based, used in Islam for religious events.
A calendar date is a specific reference to a day within a year, based on a calendar system. It helps us organize events, and record history. A date combines the day, month, and year, for example 21 August 2025.
Calendar dates are used in many ways, such as for history, religion, legal records, business, daily life activities such as birthdays, anniversaries, etc.
The most widely used date system is the Gregorian calendar, introduced in 1582. Other date formats include the Julian calendar, the Islamic Hijri, the Hebrew, the Persian, and the Ethiopian calendar.
Different regions use different formats, such as DD/MM/YYYY in India and the UK, MM/DD/YYYY in the US, and YYYY-MM-DD for the ISO 8601 standard.
A date consists of the day of the month, month, year, and sometimes the day of the week. Leap years add an extra day in February to keep the calendar aligned with the solar year.
Different cultures mark dates differently. For example, Islamic dates are based on lunar months, Chinese calendars follow lunisolar cycles with zodiac years, and Hindu calendars calculate festivals based on moon phases.