hugo/docs/content/en/functions/adddate.md

title	description	date	publishdate	lastmod	categories	menu	keywords	signature	workson	hugoversion	relatedfuncs	deprecated	aliases
.AddDate	Returns the time corresponding to adding the given number of years, months, and days to the given time.Time value.	2017-02-01	2017-02-01	2017-02-01	functions	docs parent functions	dates time	.AddDate YEARS MONTHS DAYS	times		now	false

{{ $d := "2022-01-01" | time.AsTime }}

{{ $d.AddDate 0 0 1 | time.Format "2006-01-02" }} --> 2022-01-02
{{ $d.AddDate 0 1 1 | time.Format "2006-01-02" }} --> 2022-02-02
{{ $d.AddDate 1 1 1 | time.Format "2006-01-02" }} --> 2023-02-02

{{ $d.AddDate -1 -1 -1 | time.Format "2006-01-02" }} --> 2020-11-30

{{% note %}} When adding months or years, Hugo normalizes the final time.Time value if the resulting day does not exist. For example, adding one month to 31 January produces 2 March or 3 March, depending on the year.

See this explanation from the Go team. {{% /note %}}

{{ $d := "2023-01-31" | time.AsTime }}
{{ $d.AddDate 0 1 0 | time.Format "2006-01-02" }} --> 2023-03-03

{{ $d := "2024-01-31" | time.AsTime }}
{{ $d.AddDate 0 1 0 | time.Format "2006-01-02" }} --> 2024-03-02

{{ $d := "2024-02-29" | time.AsTime }}
{{ $d.AddDate 1 0 0 | time.Format "2006-01-02" }} --> 2025-03-01