Make sure to define a column with the pivot_values, and a column with the pivot_columns: 2. If date (or timestamp) d1 represents an earlier point in time than d2, then MONTHS_BETWEEN(d1, d2) returns a negative value; otherwise it returns a positive value. This is the DATE_TRUNC function that worked fine but starts Monday: DATE_TRUNC function is used to truncate a timestamp or date to a specific level of granularity, such as truncating a timestamp to the day, hour, minute, etc. Each date value contains the century, year, month, day, hour, minute, second and. これにより、たとえば、年のN番目の日を選択できます。. Please. functions. orellabac orellabac. We were recently working on a Snowflake data warehousing project. The simplest form is to use part_trunc and truncate to 'week' using week_start 1. functions. The sequence of the 3 params is different from the SQL function, which two overloads: CONVERT_TIMEZONE ( <source_tz> , <target_tz> , <source_timestamp_ntz> ) The first parameter source_tz is optional. To remove the leading zeros we can use the Ltrim function of the Snowflake. Snowflake powers a huge variety of applications across many industries and use-cases. So, by using the “date_trunc ()” function to truncate the timestamp for getting the required output. 4 years ago. Converting Valid Character Strings to Dates, Times, or Timestamps. A summary of each function. TIMESTAMP_TRUNC is very handy for aggregating your data by a particular date_part, like HOUR, while also accounting for different timestamps. I would like to split this column into 15 minutes interval in my final output. Round and format result as a string, e. You may use a combination of DATE_TRUNC and DATEADD to find January 1 of two years ago. 4k 5 5 gold badges 23 23 silver badges 31 31 bronze badges. Note that truncation is not the. ) Redshift | Snowflake ----- | ----- DELETE customers | DELETE from customers. date_trunc¶ snowflake. Your result set may have different observation_time values: Use a. The later point it seems cannot be done with. It could happen that some string values present on them are bigger than 16 MB. The default is the current value of the following session parameters: DATE_OUTPUT_FORMAT (for DATE inputs) TIME_OUTPUT_FORMAT (for TIME inputs) TIMESTAMP_OUTPUT_FORMAT (for TIMESTAMP inputs) For binary_expr, specifies the format in which to produce the string (e. I. Follow answered Mar 8, 2022 at 7:47. How to Group by Time in Snowflake. What about there is a gap in the time series data? e. It includes the following information: Behavior changes; New features; Customer-facing bug fixes; Note: As of September 2023, Snowpark Library for Python release notes are published on the Snowflake documentation site and will no longer appear on this page. はじめに snowflake の 日時(日付、時刻含む)について 少しづつだが、まとめておく。 目次 【1】日時(日付、時刻含む)のデータ型 【2】現在日時を返す関数 【3】日時(日付、時刻含む)の変換 1)キャスト 2)date_from_parts関数 【4】日時の計算 1)dateadd関数 2)datediff関数 3)date_trunc関数 4. Is it a bug or is there any other way to remove the time component altogether ? date_trunc¶. It shows a similar result, converting the date to a month and year value, which changes the day to the first of that month. 1 What is the Syntax of the DATE_TRUNC function? 2. To control the output format, use the session parameter TIMESTAMP_NTZ_OUTPUT_FORMAT. One solution would be: first, move the shift times by 3 hours. TO_UNIXTIME () – convert a regular date format into a unix time date. Otherwise, the current session time zone is used. I wanted to start the week date to Saturday. This example uses TRUNC on a date to truncate it to a day. TIME. cast (CREATED_DT AS Date) it will returns you only date. Expand Post. Develop with Snowflake. WHERE (CREATED_AT::DATE BETWEEN (CURRENT_DATE::DATE - INTERVAL '1 WEEK') AND CURRENT_DATE::DATE). snowflake. TRUNCATE TABLE. 4. 5 is rounded to -1. Add 1 if you prefer 1 - 12. Follow asked Dec 5, 2022 at 10:48. DATE_TRUNC (with a WEEK part) Truncates the input week to start on Monday. > Knowledge Base Articles. I wanted to start the week date to Saturday. Thank you !! – Vasu. Adjusting the Scale Factor¶. If either the input_expr or the scale_expr is NULL, then the result is NULL. Removes all rows from a table but leaves the table intact (including all privileges and constraints on the table). cast (CREATED_DT AS Date) it will returns you only date. The DATE_PART function allows you to extract a specified date part from a date/time. If the variant contains a date, the date value is preserved as is. When filtering based on a date and the report-timezone is specified, that date. . For source_tz and target_tz, you can specify a time zone name or a. This means that if the total storage used for the. date_or_time_expr (Required) must be a date or timestamp expression. The timestamp data type always contains milliseconds. 複数の行が評価される場合(例: 入力が複数の行を含むテーブルの列名である場合)、値が秒. Then adding 6 days gives you the last day. Notez que la troncation n’est pas la même chose que l’extraction. CURRENT_DATE() function will return today's date i. For more information, see Overview of. Make a date not a date. 切り捨ては抽出とは異なります。. the day belongs to. I have ISO week and year as yyyy|ww. The scale factor is a cost control mechanism that allows you to set an upper bound on the amount of compute resources a warehouse can lease for query acceleration. show parameters like 'WEEK_START%'; alter session set WEEK_START = 7;Episode #2 of Snowflake SQL Context Functions Part-2 demonstrates the power of date and time context functions with real-life examples. As defined in the ISO 8601 standard (for dates and time formats), ISO weeks always start on Monday and “belong” to the year that contains the Thursday of that week. how to retrieve quarter and year values to date. But, sometimes, we cannot get what we need. ) before adjusting the time by hours. Converts an input expression to a date: For a string expression, the result of converting the string to a date. It seems snowflake does not recognize 'ww' format. 0; profit := revenue - cost; RETURN profit;. Note that the function trunc is overloaded with date_trunc for datetime types. For example, -0. 165k 23 23 gold badges 243 243 silver badges 282 282 bronze badges. Consider these objects: t1 » v1 » v2. Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this siteThe data type should be one of the numeric data types, such as FLOAT or NUMBER. Share. Database :SNOWFLAKE_SAMPLE_DATA. Year. Disclaimer:All the videos in this channel are purely educational purposes and not authorized nor associated with Snowflak. Note that the function trunc is overloaded with date_trunc for datetime types. snowflake convert string to timestamp. 805. If you’d rather not receive future emails from Snowflake,A more general form of the question is Snowflake takes the simpler approach, and answer all units of date_diff in the difference of the values at the unit compared. , day, month, etc. A date to be converted into a timestamp. If the value is of type TIMESTAMP_TZ, the time zone is taken from its value. as number_of_jobs from query_history where start_time >= date_trunc (month, current_date) group by 1 order by 2 desc; Copy. By the timestamp column, we can group the data by minute, hour, day, etc. The data type returned by TRUNCATE (33. これを使用して、一部の計算を簡素化できます。. While Snowflake is blazing fast for most queries, it too suffers from poor performance when processing these types of joins. Important. GROUP BY 1 ORDER BY 2 DESC) SELECT DATE_TRUNC ('week', date), AVG (credits_used) AS avg_daily_credits FROM. See also:Usage Notes. Automated & crowdsourced documentation. Is there a simple way to return the last day of the most recent quarter in Snowflake? We use financial quarters with last days being: Jan. Note that truncation is. end_time) group by 1 Using the same dataset as above, this query 7 executed in 2. date_task),10) as week_start ,sum(case when. as trip_count, date_trunc('DAY', starttime) as starttime from demo. Conversion of time zone in snowflake sql. Improve this answer. This is the DATE_TRUNC function that worked fine but starts Monday:DATE_TRUNC function is used to truncate a timestamp or date to a specific level of granularity, such as truncating a timestamp to the day, hour, minute, etc. 一連の着信タイムスタンプにタイムゾーンが指定されていない場合、Snowflakeは、タイムスタンプが設定されたタイムゾーンの現地時間を表すと仮定して、これらの文字列をロードします。. Removes all rows from a table but leaves the table intact (including all privileges and constraints on the table). Like. TO_TIMESTAMP. Variables are defined with the set command. Snowflake: DATE_TRUNC has many supported periods it can truncate to: SELECT '1921-12-23'::date as d ,DATE_TRUNC('year', d) as d_trunc_to_year; gives: D D_TRUNC_TO_YEAR; 1921-12-23: 1921-01-01: Oracle: Oracle has TRUNC. Suppose you have such a variable: set t = to_timestamp_ntz ('2021-12-28 14:25:36. 例:. You will then load test against custom API endpoints and scale the backend both vertically and horizontally to. Snowflake also provides the TRUNC function, but it requires the unit to be. The equivalent in Snowflake then would be: DATEADD(DAY,-3,DATE_TRUNC(WEEK,GETDATE())) However, taking your example literally, Snowflake would output minus 3 weeks from the start of "this week" DATEADD(WEEK, -3, DATE_TRUNC(WEEK,GETDATE())) SELECT COUNT(ORDER_DATE) as COUNT_ORDER_DATE, ORDER_DATE FROM ORDERS GROUP BY :datebucket(ORDER_DATE), ORDER_DATE ORDER BY COUNT_ORDER_DATE DESC; So could your query work if it was modified like this: SELECT date, address FROM database. Snowflake date_trunc to remove time from date. SELECT COUNT (NUM) FROM TABLE WHERE STATUS = 'CNLD' AND TRUNC (TO_DATE ('1970-01-01','YYYY-MM-DD') + OPEN_DATE/86400) = trunc (sysdate) Output (Just need Count). functions. 14, 1) is NUMBER (4, 1). In Snowflake and Databricks, you can use the DATE_TRUNC function using the following syntax:. For 7/30, the following query would use 7/25 data when computing the 3-day moving average for 7/30. as to the prior month window that can be done via DATE_TRUNC and DATEADD. DATE_TRUNC('datepart', timestamp) Arguments. Add a comment |Usage Notes¶. I want to truncate date to week but if a week runs over 2 months, it can truncate a new week start date at 1st day of the month as well. I am following the ELT framework for modeling data in a Snowflake warehouse. date_or_time_expr は、日付、時刻、またはタイムスタンプに評価される必要があります。これは、追加する日付、時刻、またはタイムスタンプです。例えば2018年8月1日に、2日を追加する場合、これは '2018-08-01'::DATE になります。 snowflake. 2. I understand Snowflake will process my personal. For example, for Jan 2022, 1st Jan is Week 0, 2nd Jan is Week 1, 9th Jan is Week 2, 16 Jan is Week 3, 23 Jan is Week 4, and 30th Jan is Week 4. Expected as per documentation: 2019-09-23. Also, you have learned the difference between trunc() and date_trunc() functions. functions. Computes the inverse cosine (arc cosine) of its input; the result is a number in the interval [0, pi]. Time Travel lets us instantly roll back the entire warehouse to any point during a chosen retention window. snowpark. snowflake. Q&A for work. Snowflake does: unit_answer = TRUNC( unit, to_date ) - TRUNC( unit, from_date);. This example uses TRUNC on a date to truncate it into a month. Improve this answer. 06-04-2021 01:16 AM. functions. g. g. The function you need here is date_trunc (): -- returns number of. the output below displays count in last 24 hours. How to Group by Time in Snowflake. It does not truncate or manipulate the timestamp's granularity. It may be positive or negative. functions. select COUNT(table_id), DATE_TRUNC('WEEK', DATEADD(Day, -49, CURRENT_DATE)) FROM data_warehouse_source GROUP BY 2A função sempre retorna DATE. You need to have a constant set of values to pivot on and obviously using dates won’t give you this. select 12. From the documentation: date_part (): The. Note: BigQuery’s DATE_TRUNC function supports the truncation of date types, whereas Snowflake, Redshift, and Databricks’ <date/time field> can be a date or timestamp data type. However, DATE_TRUNC with the ISOYEAR date part. TO_TIMESTAMP (str, format) 5. Also, you will probably need an aggregate function for the field address (for example any_value (address): select :datebucket (date), any_value (address) from database. 000 +0000). Rating: 4. In dbt Labs’ own words: For teams that are doing analytics work today (all in SQL), and who have aspirations of doing data science / ML work (in Python) tomorrow, dbt can make the shift. 1 Answer 1. 1 Answer. If the data type is TIME, then the date_or_time_part must be in units of hours or smaller, not days or bigger. 8K views; Top Rated Answers. Collaboration With Snowflake. date_trunc (part: ColumnOrName, expr: ColumnOrName) → Column [source] ¶ Truncates a DATE, TIME, or TIMESTAMP to the specified precision. TIME_SLICE. Like Liked Unlike Reply 1 like. O truncamento não remove o mês e o dia; em vez disso, ele os define para a data mais próxima no período especificado. snowpark. Snowflakeは、整数を秒として解釈することが意図されている場合にのみ、整数を含む文字列で TO_DATE、 TO_TIME または TO_TIMESTAMP を呼び出すことをお勧めします。. This means that a day in one year might belong to a week in a different year: For days in early January, the WOY (week of the year) value can be 52 or 53 (i. It worked fine. 6. Postgres 13 or older. 예를 들어, 타임스탬프를 분기로 자르는 경우, 원래 타임스탬프 분기의 첫 번째 날 자정에 해당하는 타임스탬프가 반환됩니다. date_trunc (part: ColumnOrName, expr: ColumnOrName) → Column [source] ¶ Truncates a DATE, TIME, or TIMESTAMP to the specified precision. g. 3. 2017) YEAROFWEEK [1] Year that the extracted week belongs to. Syntax TRUNCATE( <input_expr> [ , <scale_expr> ] ) TRUNC( <input_expr> [ , <scale_expr> ] ) Arguments input_expr The value or expression to operate on. ) field selects to which precision to. DATE_TRUNC. date_trunc snowflake. to_date('2021|13','yyyy|ww') is not working. So the following was created. The data type returned by TRUNCATE (3. 300'); You can truncate the milliseconds and leave the same data type, you will still see zeros but not different values:So, for example, if today is Monday 2021-06-28, I only want the results from Monday 2021-06-21 to Sunday 2021-06-27. Valid units for unit are (case-insensitive): 'YEAR', 'YYYY', 'YY': truncate to the first date of the year that the expr falls in, the time part will be zero out. In this article, we will check what are c ommonly used date functions in the Snowflake cloud data warehouse. In those case I would want just to truncate them to match the column length and complete the COPY. 1,015 13 13. functions. Hi - We recently migrated to Snowflake from Postgres and are having issues with date_trunc when running in Metabsae. 1. Ponmathi. This allows, for example, choosing the N-th day in a year, which can be. Usage Notes¶. In T-SQL, the first day of the week is defined by the @@DATEFIRST T. Connect and share knowledge within a single location that is structured and easy to search. 3. How to get dynamic pivots in Snowflake. The return value is always of type TIMESTAMP_TZ. In the following example, the original date falls on a Sunday. For example, get the current date, subtract date values, etc. Knowledge Base;. Extracts the specified date or time part from a date, time, or timestamp. For week 20: 20 / 2 == 10; for week 21: 21 / 2 == 10 as well. As Lukasz points out the second parameter is the start_month SAP doc's. You can take the week number and integer divide it by 2. Provides alternative syntax for DATE_TRUNC (reverses the two arguments). However, this answer is definitely the "easiest" way to go. But the 2 parameter version is in the form: CONVERT_TIMEZONE ( <target_tz> , <source_timestamp> ) but you are doing ( <source_timestamp>, <target_tz>) Also the - INTERVAL '5 HOUR' appears the same as "to UTC for the current not in Daylight savings time", it would seem safer to use the complete version of. DATE_TRUNC('QUARTER', date) can be useful also, or using YEAR(date), QUARTER(date) Share. Let’s say you. This function takes a timestamp or date and truncates it to whatever element you want. Snowflake date_trunc function docsTO_DATE() function accepts string/varchar format date and converts to Date Data type. In most use cases, Snowflake correctly handles date and timestamp values formatted as strings. The goal is to extract a portion out of a timestamp. The offset is measured in: The number of UTF-8 characters if the input is VARCHAR. 5401041667. the Date keyword is actually casting it. #standardSQL SELECT DATE_TRUNC (CURRENT_DATE (), YEAR) as YEAR. But major point to note is you MUST NOT use SEQx() as the number generator (you can use it in the ORDER BY, but that is not needed). thus your code should be (TRUNC(Target_quikvalf. how to get only date from Getdate() i ahve a query like when "date_part"("dw",current_date()) = 2 and "date_part"("dy",current_date()) > 2 thenThis blog post discusses strategies and best practices to improve Snowflake price-performance by reducing compute spend via the use of built-in mechanisms to store similar data together, create…DATE_TRUNC. on Snowflake with the accepted answer `CAST(Round((day( current_date() ) +6)/7,0) as VARCHAR) as. Postgres 13 or older. ‘John’ which is present in the 20th row, then the row_number will be displayed for that particular data is 20. YEAR. If a non-integer decimal expression is input, the scale of the result is inherited. If the value is of type TIMESTAMP_TZ, the time zone is taken from its value. flamber July 26, 2022, 12:49pmHere are the function prototypes: FROM_UNIXTIME () – convert a unix time date into a normal date. End-to-end visibility into your data. snowpark. date_trunc ('second', queries. Special calculation is needed for week/quarter. 31 Thanks! 0. Both Oracle and Snowflake have FLOAT as column. Any valid year (e. The DATE_TRUNC Function - Amazon Redshift takes timestamp as input and provides a timestamp as output: DATE_TRUNC ('datepart', timestamp) For example: SELECT DATE_TRUNC ('month', '2019-05-07'::timestamp) 2019-05-01 00:00:00. SELECT left(t. date_trunc snowflake. TO_DATE function is primarily used to convert a timestamp or a string into a date. Also deletes the load metadata for the table, which allows the same files to be loaded into the table again after the command completes. Specifies the day of week used to calculate the date for the previous day. Specifies the input date; can be a date or timestamp. 2 DATE_TRUNC (). select date_trunc(month, usage. Share your feedback. Adding more than 3-4 columns tends to increase costs more than benefits. When converting from a type with less precision to a type with more precision, conversion uses default values. Improve this answer. which yields an output of: float_serial_number. To Reproduce Steps to reproduce the behavior: Run select date_trunc('week', current_timestamp)::string in data warehouse (Snowflake) un select date_trunc('week', current_timestamp)::string in Metabase SQL query; Expected behaviorHow to Generate a Series in Snowflake. e. date_trunc (part: Union [Column, str], expr: Union [Column, str]) → Column [source] ¶ Truncates a DATE, TIME, or TIMESTAMP to the specified precision. 複数の行が評価される場合(例: 入力が複数の行を含むテーブルの列名である場合)、値が秒. For more. g. For example, CEIL (-1. Thanks for quick help. Mike Walton (Snowflake) 4 years ago. Most of what I'm seeing something akin to a date_dimensions table but I need to be able to create virtual billing dates each month and apply some fraction of transaction to each date. Snowflake는 문자열 형식의 날짜 및 타임스탬프 값을 올바르게 처리합니다. Follow. Select date_trunc ('week',dateTime) Date_week, Max (Ranking) Runing_Total_ID from (select datetime, id , dense_rank () over (order by datetime) as Ranking from Table1) group by 1. functions. DATE. 2017) DAY , DAYOFMONTH. select 12. 2 DATE_TRUNC () Argument Details : 3 Examples of DATE_TRUNC () function in Snowflake: 3. Then that is our start of financial year. It should have been DATEDIFF NOT DATEADD with respect to the WEEK parameter. scale_expr. In SQL Server I can do this using recursive SQL but looks like that functionality is not available in Snowflake. Alternative option. where trunc (date_1) = trunc (date_2)Arguments¶ source_expr. Usage Notes¶. Sometimes you’ll need to specify what format the string is in through the function arguments. -- Example of the Function DATE_TRUNC (CAST/CONVERT and custom logic in SQL SERVER/ SQL Database) -- Aliasses TRUNC SELECT CURRENT_TIMESTAMP() AS T,. If the value is a non-integer numeric value (for example, FLOAT) the value will be rounded to the nearest integer. date_trunc('day',transaction_date) + interval '1' month * generate_series(0,11) I've been having trouble finding analogous syntax in Snowflake. date_trunc¶ snowflake. 2022-09-29 23:59:59. See the example below to see how you can aggregate by HOUR: SELECT SUM(number) AS total, TIMESTAMP_TRUNC (date, HOUR) AS hour FROM ( SELECT CAST('2021-02-04 12:50:01-7:00' AS. SQL. asked Aug 22, 2019 at 5:09. Following is an example of how I used to use date_trunc to match queried timestamps to only the last 4 months including the current month, but only if a week has passed into this month already: WHERE date_trunc('month', QUERY_DATE) BETWEEN date_trunc('month', now()) - INTERVAL '4 MONTH' AND date_trunc('month', now() -. Then adding 6 days gives you the last day. date_or_time_expr. date_or_time_expr は、日付、時刻、またはタイムスタンプに評価される必要があります。これは、追加する日付、時刻、またはタイムスタンプです。例えば2018年8月1日に、2日を追加する場合、これは '2018-08-01'::DATE になります。snowflake. SELECT date_part ('week', value)::int / 2, array_agg (value) FROM mydates GROUP BY 1. In certain cases, such as string-based comparisons or when a result depends on a different timestamp format than is set in the session parameters, we recommend explicitly converting. Note: If you are using SnowSQL or the Classic Console, use this example instead (see Using Snowflake Scripting in SnowSQL and the Classic Console ): EXECUTE IMMEDIATE $$ DECLARE profit number(38, 2) DEFAULT 0. Calculate number of specific days between dates in Snowflake. You can use the datediff function to calculate the number of days between the start end end dates. You can then convert to the format you'd like. Note that this is different from DROP TABLE, which removes the table from the. It has the following syntax: DATE_TRUNC (date_expression, date_part) Thinking back to our example company, our fictional analyst might use the code below to truncate the date, June 28, 2021, to the beginning of June, June 1, 2021. posting_date between ‘2013–01–01’ and ‘2013–12–31’ order by budat desc; I get the following. 3 has two digits prior to the decimal point, but the data type NUMBER (3,2) has room for only one digit before the decimal point. Read the latest on our blog. snowflake. For example, suppose that you set the scale factor to 5 for a medium warehouse. . When you say you "tried Dateadd" - how did you try it? I'm wondering if you are using it correctly. snowflake. date_trunc (part: Union [Column, str], expr: Union [Column, str]) → Column [source] ¶ Truncates a DATE, TIME, or TIMESTAMP to the specified precision. in the following example, I want to calculate three days moving average. select trunc (x / 3600 / 24) days, trunc (x / 60 / 60)-trunc (x / 3600 / 24)* 24 hours, trunc (mod (x, 3600)/ 60) min , trunc (mod (x, 60)) sec;TO_DATE , DATE. When date_or_time_part is week (or any of its variations), the output is controlled by the session parameter. 000'. Specifies the date and time expressions to use for building a timestamp where date_expr provides the year, month, and day for the timestamp and time_expr provides the hour, minute, second, and nanoseconds within the day. SELECT date_trunc ('hour', date1) AS hour_stump , (extract (minute FROM date1)::int / 5) AS min5_slot , count (*) FROM table1 GROUP BY 1, 2 ORDER BY 1, 2; You could GROUP BY two columns: a timestamp truncated to the hour and a 5-minute-slot. This function can be used to calculate the start and end times of fixed-width “buckets” into which data can be categorized. DATE 、 TIME 、または TIMESTAMP を指定された精度に切り捨てます。. But, sometimes, we cannot get what we need. – forpas. Possible Values. I tried with this, but this is the last 7 days, without considering week end or start. WITH MY_CTE AS ( SELECT PRS_ID, DATE_TRUNC (MONTH, MIN (BGN_DATE)) AS MONTH_START FROM myTable WHERE EMP_STS = 'T' GROUP BY 1 ) SELECT TO_CHAR (MONTH_START, 'yyyy-mm') AS PERIOD, COUNT (PRS_ID) GROUP BY 1. Truncates a DATE, TIME, or TIMESTAMP to the specified precision. I have seen this issue reported. Extracts the three-letter month name from the specified date or timestamp. You can pass the input number or string as the first parameter in the Ltrim function and then pass the 0 as the second. 9) is -1, not -2. functions. It worked. DATE. CURRENT_DATE () is already of DATE type so you should use as below. TO_DATE , DATE. note: both view returns stage storage usage within the last 365 days (1 year). A pure "date" is stored as a date with the time portion set to 00:00:00 (midnight at the beginning of the day), and TRUNC ( date) will take any date and truncate the time to 00:00:00, so if you need to compare two dates you can write. Thereafter, the weeks will be labelled 1, 2, 3,. Note that truncation is not the. 0; BEGIN LET cost number(38, 2) := 100. Hi, How to get first day of the current year in snowflake without date_trunc function . g. and the query went fine :DWhat is SUBSTRING () Function in Snowflake? SUBSTRING () function helps to get the substring from a string by providing the starting index and length of the substring. The value I'm trying to get to is Friday's date, which is 7/19/2019 - so I can group on it and return weekly counts. HOUR / MINUTE / SECOND¶. e).