date comparison problem - c#-3.0

I have a string named date . date holds date like jan 10. I want to check whether it falls between two dates or not . Example jan 10 is between dec 10 and feb 10. How can I do this task?

Convert your dates to DateTime and than use the JPLabs extension method Between.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace JpLabs.Extensions
{
public static class ComparableExt
{
static public bool Between<T>(this T actual, T lower, T upper) where T : IComparable<T>
{
return actual.CompareTo(lower) >= 0 && actual.CompareTo(upper) < 0;
}
}
}
I hope it helps.

Manish
This should do it if you are using c#
public bool IsDateBetweenOtherDates(DateTime startDate,DateTime endDate, DateTime testDate)
{
return startDate < testDate && endDate > testDate;
}

string date = "jan 10";
var dt = DateTime.ParseExact(date, "MMM dd", CultureInfo.InvariantCulture);
if (dt < new DateTime(dt.Year, 12, 10) &&
dt > new DateTime(dt.Year, 2, 10))
{
// the date is between 10 feb and 10 dec.
}

You need to use DateTime.TryParse() to turn your string into a DateTime, which can then be compared to other dates.
DateTime minDate = // minimum boundary
DateTime maxDate = // maximum boundary
string input = "January 10, 2010";
DateTime inputDate;
if (DateTime.TryParse(input, out inputDate))
{
if (inputDate > minDate && inputDate < maxDate)
{
...
}
}

Try this:
public bool IsDateBetweenOtherDates(DateTime startDate,DateTime endDate, DateTime testDate)
{
return startDate < testDate && endDate > testDate;
}

Related

How can I add working days to a specific date (Flutter)?

I want to add the calulated working days to a specific date.
For example
I want to add 14 working days
date -> 08.17.2022 (it is input)
newDate -> 09.06.20222 (it is output)
I tried it with the code below but it didn't work as I want. What is my wrong? How can I do that?
Thanks in advance.
final workingDays = <DateTime>[];
final currentDate = DateTime.fromMicrosecondsSinceEpoch(
widget.siparisModel.siparisTarih.microsecondsSinceEpoch);
final orderDate = currentDate.add(Duration(days: 15));
DateTime indexDate = currentDate;
while (indexDate.difference(orderDate).inDays != 0) {
final isWeekendDay = indexDate.weekday == DateTime.saturday || indexDate.weekday == DateTime.sunday;
if (!isWeekendDay) {
workingDays.add(indexDate);
}
indexDate = indexDate.add(Duration(days: 15));
}
You could do something like this:
var newDate = DateTime(2022, 08, 17); // Copy from some "currentDate"
var numOfWeekdaysToAdd = 14;
while (numOfWeekdaysToAdd > 0) {
do {
newDate = newDate.add(Duration(days: 1));
} while (newDate.weekday == DateTime.saturday || newDate.weekday == DateTime.sunday);
numOfWeekdaysToAdd--;
}
Working DartPad demo:
https://dartpad.dev/?id=6ef6f4306944b350edfb77905239297e
If you want to, you could extend the "weekend-check" and make it more complex to also check for holidays in a specific locale. In that case I'd have a list of holiday-dates, and just add something like holidayDates.contains(newDate)

How to display time ago like Youtube in Flutter

I'm writing a flutter app to clone some Youtube functionalities using Youtube API V3.
The app fetches video timestamp as a String from youtube video API
Each timestamp has this format :
YYYY-MM-DDTHH:MM:SSZ
One example would be:
2020-07-12T20:42:19Z
I would like to display in a text :
1 hour
1 hours ago
4 weeks ago
11 months ago
1 year ago
...
I've created an extension on String
extension StringExtension on String {
static String displayTimeAgoFromTimestamp(String timestamp) {
final year = int.parse(timestamp.substring(0, 4));
final month = int.parse(timestamp.substring(5, 7));
final day = int.parse(timestamp.substring(8, 10));
final hour = int.parse(timestamp.substring(11, 13));
final minute = int.parse(timestamp.substring(14, 16));
final DateTime videoDate = DateTime(year, month, day, hour, minute);
final int diffInHours = DateTime.now().difference(videoDate).inHours;
String timeAgo = '';
String timeUnit = '';
int timeValue = 0;
if (diffInHours < 1) {
final diffInMinutes = DateTime.now().difference(videoDate).inMinutes;
timeValue = diffInMinutes;
timeUnit = 'minute';
} else if (diffInHours < 24) {
timeValue = diffInHours;
timeUnit = 'hour';
} else if (diffInHours >= 24 && diffInHours < 24 * 7) {
timeValue = (diffInHours / 24).floor();
timeUnit = 'day';
} else if (diffInHours >= 24 * 7 && diffInHours < 24 * 30) {
timeValue = (diffInHours / (24 * 7)).floor();
timeUnit = 'week';
} else if (diffInHours >= 24 * 30 && diffInHours < 24 * 12 * 30) {
timeValue = (diffInHours / (24 * 30)).floor();
timeUnit = 'month';
} else {
timeValue = (diffInHours / (24 * 365)).floor();
timeUnit = 'year';
}
timeAgo = timeValue.toString() + ' ' + timeUnit;
timeAgo += timeValue > 1 ? 's' : '';
return timeAgo + ' ago';
}
}
Then call in text:
StringExtension.displayTimeAgoFromTimestamp(video.timestamp)
You can use the timeago package
example code below
import 'package:timeago/timeago.dart' as timeago;
main() {
final fifteenAgo = new DateTime.now().subtract(new Duration(minutes: 15));
print(timeago.format(fifteenAgo)); // 15 minutes ago
print(timeago.format(fifteenAgo, locale: 'en_short')); // 15m
print(timeago.format(fifteenAgo, locale: 'es')); // hace 15 minutos
}
to use it with the YYYY-MM-DDTHH:MM:SSZ time format you can convert the String to a DateTime then perform the operation on the DateTime variable
DateTime time = DateTime.parse("2020-07-12T20:42:19Z");
print(timeago.format(time));
I've created reusable function for sample, this might be helpful!!
import 'package:intl/intl.dart';
//for DateTime manipulation need to add this package
import 'package:timeago/timeago.dart' as timeago;
void main(){
//creating this getTimeAgo function to format dateTime with user inputs
dynamic getTimeAgo(DateTime d) {
dynamic value = "";
//setting current time variable now
final now = DateTime.now();
//converting the user provided date to LocalTime
final recvDate = d.toLocal();
//declaring today's date in today variable
final today = DateTime(now.year, now.month, now.day);
//declaring yesterday's date in yesterday variable
final yesterday = DateTime(now.year, now.month, now.day - 1);
//declaring user provided date's in date variable
final date = DateTime(recvDate.year, recvDate.month, recvDate.day);
//comparing today's date is equal to user provided date then return value with timeAgo flutter package response
if (date == today) {
final curtimeNow = timeago.format(d);
if (curtimeNow == 'a day ago') {
value = "1 day ago";
} else if (curtimeNow == 'about an hour ago') {
value = "1 hour ago";
} else {
value = curtimeNow;
}
} //comparing yesterday's date is equal to user provided date then return 1 day ago
else if (date == yesterday) {
value='1 day ago';
} //else the user provided date then return as the date format of dd MMM yyyy Eg. 10 Mar 2022
else {
value = DateFormat('dd MMM yyyy').format(date);
}
//returning the response
return value;
}
//declaring the date which is to used be formatted
var recvdDateTime=DateTime.now().subtract(Duration(minutes: 45));;
//calling the getTimeAgo (fn) with user input
getTimeAgo(DateTime.parse(recvdDateTime));
}

Get current Week of the Month as a Number

How do I get the current week of the month as a number in Dart? I need to create some sort of calender with a week view where it says something like "2. Week of January"
You can use DateTime().now() to get the current time and date of the system or today's date also. Here is the code snippet below:
// Current date and time of system
String date = DateTime.now().toString();
// This will generate the time and date for first day of month
String firstDay = date.substring(0, 8) + '01' + date.substring(10);
// week day for the first day of the month
int weekDay = DateTime.parse(firstDay).weekday;
DateTime testDate = DateTime.now();
int weekOfMonth;
// If your calender starts from Monday
weekDay--;
weekOfMonth = ((testDate.day + weekDay) / 7).ceil();
print('Week of the month: $weekOfMonth');
weekDay++;
// If your calender starts from sunday
if (weekDay == 7) {
weekDay = 0;
}
weekOfMonth = ((testDate.day + weekDay) / 7).ceil();
print('Week of the month: $weekOfMonth');
Alternatively, if are looking for a complete implementation of the calender month UI then click here
My Answer is impaired from #dblank answer
extension DateTimeExtension on DateTime {
int get weekOfMonth {
var date = this;
final firstDayOfTheMonth = DateTime(date.year, date.month, 1);
int sum = firstDayOfTheMonth.weekday - 1 + date.day;
if (sum % 7 == 0) {
return sum ~/ 7;
} else {
return sum ~/ 7 + 1;
}
}
}
Then use it like this:
var wom = DateTime.now().weekOfMonth;
extension DateTimeExtension on DateTime {
int get weekOfMonth {
var wom = 0;
var date = this;
while (date.month == month) {
wom++;
date = date.subtract(const Duration(days: 7));
}
return wom;
}
}
Then use it like this:
var wom = DateTime.now().weekOfMonth;

Dart: How to find number of days between two dates excluding Weekend or Predicate

I need to calculate number of days between two dates in Dart.
There is built in function for that.
leaveEndDate.difference(leaveStartDate).inDays
But I do not want weekends to be included.
Is there any way I can traverse between these 2 Dates or I can just exclude weekends.
I think you have no other choice than looping through all the days to check if this is a weekend day or not :
void main() {
DateTime date1 = DateTime(2019, 12, 01);
DateTime date2 = DateTime(2019, 12, 31);
print(getDifferenceWithoutWeekends(date1, date2));
}
int getDifferenceWithoutWeekends(DateTime startDate, DateTime endDate) {
int nbDays = 0;
DateTime currentDay = startDate;
while (currentDay.isBefore(endDate)) {
currentDay = currentDay.add(Duration(days: 1));
if (currentDay.weekday != DateTime.saturday && currentDay.weekday != DateTime.sunday) {
nbDays += 1;
}
}
return nbDays;
}
Result :
22
EDIT :
Another solution, not sure it is faster but can be useful if you need to identify the dates (you could return list<DateTime> instead of List<int> to see which day is a weekend day).
Here I build each days between the 2 dates and return 1 if this is not a weekend day, then sum the list :
void main() {
DateTime startDate = DateTime(2019, 12, 01);
DateTime endDate = DateTime(2019, 12, 31);
int nbDays = endDate.difference(startDate).inDays + 1;
List<int> days = List.generate(nbDays, (index) {
int weekDay = DateTime(startDate.year, startDate.month, startDate.day + (index)).weekday;
if (weekDay != DateTime.saturday && weekDay != DateTime.sunday) {
return 1;
}
return 0;
});
print(days.reduce((a, b) => a + b));
}
I have also prepared a function which will traverse to all dates between two dates in Dart and will calculate number of days inBetween.
int calculateDaysBetween(DateTime mStartDate, DateTime mEndDate) {
int leaveDays = mEndDate.difference(mStartDate).inDays + 1;
int leaveBalance = 0;
var mTempDateTime =
DateTime(mStartDate.year, mStartDate.month, mStartDate.day);
for (int i = 0; i < leaveDays; i++) {
mTempDateTime = DateTime(
mTempDateTime.year, mTempDateTime.month, mTempDateTime.day + 1);
if (mTempDateTime.weekday == DateTime.friday ||
mTempDateTime.weekday == DateTime.saturday) {
print('is weekend');
} else {
leaveBalance++;
}
print(mTempDateTime);
}
// Total number of days between two dates excluding weekends.
return leaveBalance;
}
Improve #Developine Answer and make it more reusable , I make 2 function.
1.Calculate Total Days Of Month
2.Calculate TotalWeekDayOfMonth
Get Total Days Of Month
int totalDaysOfMonth(int month, int year) {
final result = (month < 12) ? DateTime(year, month + 1, 0) : DateTime(year + 1, 1, 0);
return result.day;
}
Get Total WeekDay Of Month
int totalWeekDayOfMonth(int year, int month, {int day = 1}) {
int totalDayOfMonth = totalDaysOfMonth(year, month);
int result = 0;
DateTime tempDateTime = DateTime(year, month, day);
for (int i = day; i <= totalDayOfMonth; i++) {
tempDateTime = DateTime(tempDateTime.year, tempDateTime.month, i);
if (tempDateTime.weekday == DateTime.saturday || tempDateTime.weekday == DateTime.sunday) {
print('is weekend');
} else {
result++;
}
}
return result;
}
How To Use It
void main(){
final resultWithoutDay = totalWeekDayOfMonth(2019,12);
final resultWithDay = totalWeekDayOfMonth(2019,12,day: 16);
print("Without Day $resultWithoutDay"); // 22
print("With Day $resultWithDay"); // 12
}

DateTime comparison in dart

I am trying to sort list of DateTime time elements in ascending order.I have realized normal operators like > or < don't cut it. What is the best way to compare two DateTime variables ?
Simply use the methods isAfter(), isBefore() or isAtSameMomentAs() from DateTime.
Other alternative, use compareTo(DateTime other), as in the docs:
Compares this DateTime object to [other],
returning zero if the values are equal.
Returns a negative value if this DateTime [isBefore] [other]. It returns 0
if it [isAtSameMomentAs] [other], and returns a positive value otherwise
(when this [isAfter] [other]).
Here a code example of sorting dates:
void main() {
var list = [
DateTime.now().add(Duration(days: 3)),
DateTime.now().add(Duration(days: 2)),
DateTime.now(),
DateTime.now().subtract(Duration(days: 1))
];
list.sort((a, b) => a.compareTo(b));
print(list);
}
See it working here.
This is I how understood and implemented the code it will result in true / false in boolean mode.
DateTime valEnd = edate ;
DateTime date =DateTime.now();
bool valDate = date.isBefore(valEnd);
DateTime comparison in dart
DateTime.compareTo(DateTime other):
DateTime dt1 = DateTime.parse("2021-12-23 11:47:00");
DateTime dt2 = DateTime.parse("2018-02-27 10:09:00");
if(dt1.compareTo(dt2) == 0){
print("Both date time are at same moment.");
}
if(dt1.compareTo(dt2) < 0){
print("DT1 is before DT2");
}
if(dt1.compareTo(dt2) > 0){
print("DT1 is after DT2");
}
DateTime.isAtSameMomentAs(DateTime other):
DateTime dt1 = DateTime.parse("2021-12-23 11:47:00");
DateTime dt2 = DateTime.parse("2018-02-27 10:09:00");
if(dt1.isAtSameMomentAs(dt2)){
print("Both DateTime are at same moment.");
}
DateTime.isAfter(DateTime other):
DateTime dt1 = DateTime.parse("2021-12-23 11:47:00");
DateTime dt2 = DateTime.parse("2018-02-27 10:09:00");
if(dt1.isAfter(dt2)){
print("DT1 is after DT2");
}
DateTime.isBefore(DateTime other):
DateTime dt1 = DateTime.parse("2021-12-23 11:47:00");
DateTime dt2 = DateTime.parse("2018-02-27 10:09:00");
if(dt1.isBefore(dt2)){
print("DT1 is before DT2");
}