What I see over the internet is just counting how many days occur whenever you input the day of the week you need. Like between May 1 to May 31, how many mondays are there in it. What I need is to display the dates where it is monday between two given dates. I don't have any code for this now since I don't really know where to start as I've scanned already the MySQL docu but I haven't seen anything useful besides
WEEKDAY('1998-02-03 22:23:00')
or
DAYOFWEEK('1998-02-03')
which shows the day index of a certain date. (but this time, of course, I don't know which dates fall on Mondays., i need the reverse thing)
I need is when I need mondays and tuesdays in february, it will return the following:
2015-02-02
2015-02-03
2015-02-09
2015-02-10
2015-02-16
2015-02-17
2015-02-23
2015-02-24
I dont have any code to display since my progresses in mysql on our proj isn't directly related to this one I'm needing. This is another independent mysql query of our proj I'm trying to get done..
Related
I am trying to come up with a simple formula that I can extend infinitely to show me a list of dates that is separated by 2 weeks (14 days) and also includes the first of the month. The 2 weeks part is easy to accomplish with:
=A2+14
Where A2 has a date in the field to start the calculations. Then I can extend that down the column to have:
=A3+14
=A4+14
And so on... The hard part is, I also want to include the first of each month. So the list should include every other Friday and the first of the month dynamically. So the results would be like this:
2/28/2020
3/01/2020
3/13/2020
3/27/2020
4/01/2020
4/10/2020
As you can see from this list, it looks at every other Friday AND the first of the month is included in the results. I tried something like this:
=IF(MONTH(A3+14)>MONTH(A3),eomonth(A3+14,-1)+1,A2+14)
The issue from this one is that if the first of the month condition gets selected, the next date is 14 days AFTER the first of the month. It should be 14 days after the previous Friday.
try:
=ARRAYFORMULA(SORT(UNIQUE({
EOMONTH(ROW(INDIRECT(C1&":"&C2)), 0)+1;
FILTER(ROW(INDIRECT(C1&":"&C2)),
MOD(ROW(INDIRECT("A1:A"&DAYS(C2, C1)+1)), 14)=0)+1})))
Here I'm saving the date range using golang. Suppose we have to save the all monday comes between the range of the 1-may-2018 to 14-july-2018.
How we will find all the monday between these range using golang and on the other hand we have set the start_time (8:00 A.M.) and the end_time (6:00 P.M.) of the first two coming monday in the database but on the third monday we have a change in the schedule that there is a time change like start_time (9:00 A.M.) and end_time (5:00 P.M.). Then how I will make my database to make this situation in practically using the golang.
Can Anybody help me for this to solve this solution. I made a database for and I do ppr work on it and make some fields shown below:-
Fields for Schedule //Schedule is a collection name
Id (int)
Day (string)
Start_hours (int)
Start_minutes (int)
End_hours (int)
End_minutes (int)
Start_date (timestamp)
End_date (timestamp)
How I will select monday between the selected range and how will I do the situation I explained above can anybody give guidance to me to make this situation easier. Thank you if this is a basic question then I'm really sorry.
I'd make something like this.
Find the first Monday date from the date range (see for example How do I get the first Monday of a given month in Go?
Mondays happen every week, so you can easily find the rest of dates by adding 7 days till the end date
Store all the Monday dates you found with the start and end times
I wouldn't bother with hours and minutes as you can easily get them from the timestamps in Go. Here is the simplified DB structure I would make
Fields for Schedule //Schedule is a collection name
Id (int)
Day (string)
Date (timestamp) // the actual date
Start (timestamp)
End (timestamp)
You don't need any more fields. You can get the day of the week (Day (string) in your structure, e.g. Monday) from the Date field too, but I believe if you want to query the collection by different days, this might speed things up, but be careful if you need to adjust for time zones. If you work with more than one, then store everything in UTC and you may have an extra filed Timezone, cos a date could be Monday for one zone and Sunday for another.
So, the Schedule will hold weekdays and start and end times for each of them. I'm not sure if you need to store initial date ranges, the Schedule collection will hold that range as well, form the first record to the last one. In my mind, I'd initially populate the collection with a given date range, then later on, I can modify it by adding new days, or deleting them.
When you query this collection with some start and end date range for the Date field, if your first result comes newer than 7 days from the start, this means you miss 1 or more entries from the start. If the last result comes older than 7 days from the range end, this means you miss some entries prior to the range end.
There is nothing specific to Go, in my opinion, Go works well with dates and you don't need any special date structures in your DB.
I'm an historian of medieval history and I'm trying to code networks between kings, dukes, popes etc. over a period of time of about 50 years (from 1220 to 1270) in medieval Germany. As I'm not a specialist for graph-databases I'm looking for a possibility to handle dates and date-ranges.
Are there any possibilities to handle over a date-range to an edge so that the edges, which represents a relationship, disappears after e.g. 3 years?
Are there any possibility to ask for relationships who have their date-tag in a date-range?
The common way to deal with dates in Neo4j is storing them either as a string representation or as millis since epoch (aka msec passed since Jan 01 1970).
The first approach makes the graph more easily readable the latter allows you to do math e.g. calculate deltas.
In your case I'd store two properties called validFrom and validTo on the relationships. You queries need to make sure you're looking for the correct time interval.
E.g. to find the king(s) in charge of France from Jan 01 1220 to Dec 31st 1221 you do:
MATCH (c:Country{name:'France'})-[r:HAS_KING]->(king)
WHERE r.validFrom >= -23667123600000 and r.validTo <=-23604051600000
RETURN king, r.validFrom, r.validTo
addendum
Since Neo4j 3.0 there's the APOC library which provides couple of functions for converting timestamps to/from human readable date strings.
You can also store the dates in their number representation in the following format: YYYYMMDD
In your case 12200101 would be Jan 1st 1220 and 12701231 would be Dec 31st 1270.
It's a useful and readable format and you can perform range searches like:
MATCH (h:HistoricEvent)
WHERE h.date >= 12200101 AND h.date < 12701231
RETURN h
It would also let you order by dates, if you need to.
As of Neo4J 3.4, the system handles duration and dates, see the official documentation. See more examples here.
An example related to the original question: Retrieve the historical events that happened in the last 30 days from now :
WITH duration({days: 30}) AS duration
MATCH (h:HistoricEvent)
WHERE date() - duration < date(h.date)
RETURN h
Another option for dates that keeps the number of nodes/properties you create fairly low is a linked list years (earliest year of interest - latest year), one of months (1-12), and one of dates in a month (1-31). Then every "event" in your graph can be connected to a year, month, and day. This way you don't have to create a new node for every new combination of a year month and day. You just have a single set of months, one of days, and one year. I scale the numbers to make manipulating them easier like so
Years are yyyy*10000
Months are mm*100
Date are dd
so if you run a query such as
match (event)-[:happened]->(t:time)
with event,sum(t.num) as date
return event.name,date
order by date
You will get a list of all events in chronological order with dates like Janurary 17th, 1904 appearing as 19040117 (yyyymmdd format)
Further, since these are linked lists where, for example,
...-(t0:time {num:19040000})-[:precedes]->(t1:time {num:19050000})-...
ordering is built into the nodes too.
This is, so far, how I have liked to do my event dating
I'm looking to get a snapshot of inventory for the latest date of each month.
I.E.
Feb 13
Jan 14
Feb 14
There are duplicate variables - i.e., "a" will be listed several times each month. I need to get a.) the sum of each month (easy), and b.) the snapshot of the last date available.
Part B.) is what I'm having trouble with. I've seen the EOM excel formula - but it requires entering (current, following month, etc.). I just want the formula to spit out the inventory Quantity for the last date of each month, without having to specify which month (current, following, etc.).
Any ideas?
Thanks!
I'm assuming that your data is structured something like this:
http://i.stack.imgur.com/mF3h0.png
If that is the case, you can use a formula like this:
=VLOOKUP(EOMONTH(A12,0),$A$2:$B$5,2,FALSE)
Where A12 is the month you want to find the answer for. So the full sheet looks like this:
http://i.stack.imgur.com/GR5ok.png
As you can see, the formula that I put into cell B12 and then just dragged down is pulling back the correct values for the end of month inventory count. Just populate column A with the month-year you are searching for.
Hope this helps!
I am using Objective-C within X-code.
I am iterating through a dictionary which contains a date value as one of it's keys. All I want to do is get an array of all the distinct dates so I can use them in a table, as headers. I just plan on
iterating the dictionary and adding dates to a mutable array each time I encounter a new date.
I must set previous date to new date for comparisons to work and I am having a very difficult time figuring out how to set one date equal to another date.
This seems like it should be such a simple thing to do and I am trying to avoid converting the dates to strings first - but if that's what I have to do, then so be it.
Any help would be appreciated.
Thanks,
Gerry O.
If you know the time offset is same as GMT, you could do it by dividing the date's timestamp by 86400 seconds (or three more 0s in milliseconds) and comparing those. If a time offset is there, add or subtract by 3600 seconds per hour before you divide them. But then again, leap years and seconds would break that...
Most languages have libraries support extracting the year, date, month, etc. They take everything into account, usually.
In Objc, you can get a NSDateComponents from NSCalendar's components:fromDate: method. After this, you can call the components to see exactly what each component (I suggest year, month, day) is.
I think you want code to compare dates and You need two loops nested.... where in outer loops iterates with conditional inner loop... In inner loop you just check that previously you had the same date or not...
please go through the below post on same site...
How to compare two dates in Objective-C
hope you will get solution... else clarify your question....