How to change my timestamp into a date formatted as yyyy-01-01 in snowflake (sql)

I need to change a column of timestamps (date_col) to be formatted as yyyy-01-01. January first of the year in the date_col

Example:

actual                         desired

2021-04-02 00:00:00.000         2021-01-01
1966-05-04 00:00:00.000         1966-01-01

>Solution :

Please use date_trunc

select date_trunc(year,'2021-04-02 00:00:00.000'::date);
+--------------------------------------------------+
| DATE_TRUNC(YEAR,'2021-04-02 00:00:00.000'::DATE) |
|--------------------------------------------------|
| 2021-01-01                                       |
+--------------------------------------------------+