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Snowflake provides a special set of week-related date functions (and equivalent data parts) whose behavior is consistent with the ISO week semantics: WEEK , WEEKOFYEAR [1] Week (number) of the year. The date functions in Snowflake are same or slightly different compared to other RDBMS. For details, see Supported Date and Time Parts. I was able to derive the first day of the next month, using the following: SET @strFirstOfNextMonth = (SELECT CONVERT(VARCHAR, DATEADD(m, DATEDIFF(m, 0, DATEADD(MM, 0, GETDATE())), 0 . 2.) In the following example, a set of timestamp values is stored with no time zone data. Snowflake offers multiple editions of our Data Cloud service. For example, without explicit casting, comparing string values produces string-based results: For more information about conversion functions, see Date and Time Formats in Conversion Functions. I am not able to find any good conversion code to get 2014-02-17 into 2014-02-01 without having to use concatenation and a ton of formatting. Assuming your data set might look like data in below snowflake sample table for sub-query gendata . Give it a try now Convert to Snowflake Both queries gives different result. You can use following query also to find out first day of the month, The date functions in Snowflake are same or slightly different compared to other RDBMS. DATETRUNC ('day', #9/22/2018#) = #9/22/2018#. snowflake query to subtract 1 month from current date non-integer numeric value (for example, FLOAT) the value will be Trying to pull last day of month records from a daily records table. WRF-GFS is a little too warm as well, notice . To calculate the start date from IsoWeek, we need to parse year and week values from IsoWeek, then find the first day of the week by the help of LAST_DAY() functions. Calendar Weeks and Weekdays. resulting month. Are you trying to get the first day of the previous month?