Birth date or birthdate?
birth date is a noun meaning “Alternative spelling of birthdate”; birthdate is a noun meaning “The year, month, and day of someone's birth; a date of birth”. Wiktionary gives them as spellings of the same word. birth date is written as two words and birthdate as one word; they are used differently.
What is the difference between birth date and birthdate?
| birth date | birthdate | |
|---|---|---|
| Part of speech | noun | noun |
| Meaning | Alternative spelling of birthdate | The year, month, and day of someone's birth; a date of birth |
| Example | none recorded | none recorded |
| Forms | none | birthdates |
| Pronunciation | not recorded | not recorded |
| In writing | not counted (the list counts single words) | about once in every 4 million words |
Sources: birth date and birthdate in the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Every current meaning of birth date and birthdate
birth date
- 1
Alternative spelling of birthdate
birthdate
- 1
The year, month, and day of someone's birth; a date of birth
Source: the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); obsolete, archaic, dialect and rare senses left out.
Which is more common, birth date or birthdate?
birth date is a phrase, which the list of single words does not count; birthdate about once in every 4 million words.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How many people search birth date vs birthdate?
“birth date vs birthdate” is searched about 10 times a month on Google and 10 on Bing in the United States. Google counts close variants of a query together (“birthdate vs birth date”, “birth date or birthdate”).
Sources: Google Ads keyword data through DataForSEO and Microsoft Advertising keyword data through DataForSEO, the average month from September 2025 to August 2026.