#Date setdate yesterday iso

For this reason, both the YEAROFWEEK and YEAROFWEEKISOįunctions can provide the year that the week belongs to.ġ: January 1 always starts the first week of the year and December 31 is always in the last week of the year.

Weeks have 7 days, but the first days of January and the last days of December might belong to a week in a different year.

#Date setdate yesterday iso

The parameter can have two values:Ġ: The affected week-related functions use semantics similar to the ISO semantics, in which a week belongs to a given year if at least 4 days of that week are in that year. The WEEK_OF_YEAR_POLICY session parameter controls how the WEEK and YEAROFWEEK functions behave. Ns, nsec, nanosec, nsecond, nanoseconds , Not controlled by the WEEK_START and WEEK_OF_YEAR_POLICY session parameters, as described in the next section. For usage details, see the next section, which describes how Snowflake handles calendar weeks and weekdays. Week_iso, weekofyeariso, weekofyear_iso The following two tables list the parts (case-insensitive) that can be used with these functions. With date-fns, all you have to do is pass in your date and a string format and it will then do the rest of the work.Accepts all date and time parts (see next section for details).Īccepts relevant date parts (see next section for details).Īccepts relevant date and time parts (see next section for details).Īllows a time to be “rounded” to the start of an evenly-spaced interval.Ĭertain functions (as well as their appropriate aliases and alternatives) accept a date or time part as an argument. When it comes to formatting dates in JavaScript the best option is to make use of a library such as date-fns to handle the formatting for you. log ( checkDateIsTodayOrYesterday ( new Date ( '' ) ) ) // Error 'Invalid date - neither today or yesterday'Īs you can see from the above example all we have done is package these principles into a couple of helper functions that can now check if a date that is provided is today or yesterday.įor more detail and information about comparing dates in JavaScript, have a read of my post about it here. log ( checkDateIsTodayOrYesterday (yesterdaysDate ) ) // 'yesterday'Ĭonsole. log ( checkDateIsTodayOrYesterday ( new Date ( ) ) ) // 'today'Ĭonsole. toDateString ( ) ) const checkDateIsTodayOrYesterday = someDate => const yesterdaysDate = new Date ( )

Const dateWithoutTime = someDate => new Date (someDate.