Date Converter
Convert dates between different calendar systems (Gregorian, Hijri, Julian, Hebrew) and date formats. Calculate day of the week and date differences instantly.
Select Date & Calendar
Date Information
Date in Different Formats
Calendar Comparison
| Calendar | Date | Year Type | Days in Year |
|---|
Related Dates
This date is 5 days after New Year's Day and 20 days before February 4 (World Cancer Day).
About Calendar Systems
Gregorian Calendar
The solar calendar used internationally for civil purposes. Introduced in 1582 by Pope Gregory XIII.
Leap Year: Every 4 years (except century years not divisible by 400)
Used In: Worldwide for civil purposes
Start Year: 1 AD (Anno Domini)
Hijri Calendar
The Islamic lunar calendar used for religious purposes. Begins with Hijra (migration) of Prophet Muhammad.
Leap Year: 11 leap years in 30-year cycle
Used In: Islamic religious events
Start Year: 622 AD (Year of Hijra)
Julian Calendar
The solar calendar introduced by Julius Caesar in 46 BC. Used before Gregorian reform.
Leap Year: Every 4 years without exception
Used In: Historical dates, Orthodox churches
Start Year: 45 BC
Hebrew Calendar
The lunisolar calendar used for Jewish religious observances. Based on lunar months with solar corrections.
Leap Year: 7 times in 19-year cycle
Used In: Jewish religious events
Start Year: 3761 BC (Creation)
About Date Converter
The Date Converter allows you to convert dates between different calendar systems including Gregorian, Hijri (Islamic), Julian, and Hebrew calendars. It also calculates date differences and provides various date formats for your convenience.
How Date Conversion Works
Convert to Julian Day Number
Each calendar date is first converted to a Julian Day Number (JDN) - a continuous count of days from January 1, 4713 BC.
Apply Calendar Algorithms
Specific algorithms for each calendar system are applied to convert the JDN to the target calendar's date format.
Calculate Date Differences
Date differences are calculated by subtracting Julian Day Numbers and converting back to days, weeks, and months.
Format Display
The converted date is formatted according to selected display preferences and international standards.
Common Date Conversions
| Gregorian Date | Hijri Date | Julian Date | Hebrew Date |
|---|---|---|---|
| January 1, 2025 | 19 Jumada al-thani 1445 | December 19, 2023 | 20 Tevet 5784 |
| March 21, 2025 | 11 Ramadan 1445 | March 8, 2025 | 11 Adar II 5784 |
| July 4, 2025 | 28 Dhu al-Hijjah 1445 | June 21, 2025 | 28 Tammuz 5784 |
| December 25, 2025 | 24 Jumada al-awwal 1446 | December 12, 2025 | 24 Kislev 5785 |
Date Format Standards
ISO 8601
International standard: YYYY-MM-DD (e.g., 2025-01-15). Used worldwide for data exchange.
US Format
MM/DD/YYYY (e.g., 01/15/2025). Used in United States, Philippines, and some Caribbean nations.
European Format
DD/MM/YYYY (e.g., 15/01/2025). Used in most of Europe, Asia, Africa, and Oceania.
Long Format
Month Day, Year (e.g., January 15, 2025). Used in formal documents and publications.
Tips for Date Conversion
Historical Dates
For dates before 1582, use Julian calendar as Gregorian wasn't introduced yet.
Hijri Accuracy
Hijri dates may vary by 1-2 days based on moon sighting in different regions.
Time Zone Awareness
Date conversion may be affected by time zones for dates around midnight.
Leap Years
Different calendars have different leap year rules affecting conversion accuracy.