In C# 3.0, how do I get the seconds since 1/1/2010?
Goes like this:
TimeSpan test = DateTime.Now - new DateTime(2010, 01, 01);
MessageBox.Show(test.TotalSeconds.ToString());
For one liner fun:
MessageBox.Show((DateTime.Now - new DateTime(2010, 01, 01))
.TotalSeconds.ToString());
You can substract 2 DateTime instances and get a TimeSpan:
DateTime date = new DateTime(2010,1,1);
TimeSpan diff = DateTime.Now - date;
double seconds = diff.TotalSeconds;
Just to avoid timezone issues
TimeSpan t = (DateTime.UtcNow - new DateTime(2010, 1, 1));
int timestamp = (int) t.TotalSeconds;
Console.WriteLine (timestamp);
It's really a matter of whose 2010-Jan-01 you're using and whether or not you wish to account for daylight savings.
//I'm currently in Central Daylight Time (Houston, Texas)
DateTime jan1 = new DateTime(2010, 1, 1);
//days since Jan1 + time since midnight
TimeSpan differenceWithDaylightSavings = DateTime.Now - jan1;
//one hour less than above (we "skipped" those 60 minutes about a month ago)
TimeSpan differenceWithoutDaylightSavings = (DateTime.UtcNow - jan1.ToUniversalTime());
//difference for those using UTC and 2010-Jan-01 12:00:00 AM UTC as their starting point
// (today it's 5 hours longer than differenceWithDaylightSavings)
TimeSpan utcDifference = (DateTime.UtcNow - new DateTime(2010, 1, 1));
Difference with Daylight Savings: 105.15:44:09.7003571
Difference without Daylight Savings: 105.14:44:09.7003571
UTC Difference: 105.20:44:09.7003571
To get the seconds, use the TotalSeconds property off the TimeSpan object.
protected void Page_Load(object sender, EventArgs e)
{
SecondsSinceNow(new DateTime(2010, 1, 1, 0, 0, 0));
}
private double SecondsSinceNow(DateTime compareDate)
{
System.TimeSpan timeDifference = DateTime.Now.Subtract(compareDate);
return timeDifference.TotalSeconds;
}
DateTime t1 = DateTime.Now;
DateTime p = new DateTime(2010, 1, 1);
TimeSpan d = t1 - p;
long s = (long)d.TotalSeconds;
MessageBox.Show(s.ToString());
Related
How to subtract "year=117 month=1 day=28 hour=7 min=43 sec=10" from a DateTime in c#?
I have already tried like below
split the string using regex.
add each item with -ve sign to a current DateTime value.
But I think it's not an efficient way.
Can anyone help me?
You can use below Code as per you requirement to get desired Result. Replace your Date, Time, year values in "new System.DateTime(1996, 6, 3, 22, 15, 0);"
System.DateTime date1 = new System.DateTime(1996, 6, 3, 22, 15, 0);
System.DateTime date2 = new System.DateTime(1996, 12, 6, 13, 2, 0);
System.DateTime date3 = new System.DateTime(1996, 10, 12, 8, 42, 0);
// diff1 gets 185 days, 14 hours, and 47 minutes.
System.TimeSpan diff1 = date2.Subtract(date1);
// date4 gets 4/9/1996 5:55:00 PM.
System.DateTime date4 = date3.Subtract(diff1);
// diff2 gets 55 days 4 hours and 20 minutes.
System.TimeSpan diff2 = date2 - date3;
// date5 gets 4/9/1996 5:55:00 PM.
System.DateTime date5 = date1 - diff2;
you can try DateTime's subtraction.
for that first you have to make valid DateTime object from your information and then subtract that date from current date.
see below code,
int year = 117, month = 01, day = 28;
int hour = 07, minute = 43, second = 10;
DateTime timeToSubtract =
new DateTime(year > 0? year : 1, month > 0 ? month : 1, day > 0 ? day : 1, hour, minute, second);
DateTime subtractedDate =
new DateTime((DateTime.Now - timeToSubtract).Ticks);
as you can see, we are creating a date time object with information we have (date and time which should be subtracted form current date time) by, new DateTime(year, month, day, hour, minute, second) and then subtracting this from DateTime.Now, and then creating final date out of result of this subtraction.
here in last line we are creating a date (of past). this date is of specified time ago.
i am trying to convert current year + 1 midnight date time to unix timestamp.
for that i have tried
DateTime currentTime = DateTime.Today;
DateTime yearEnd = new DateTime( currentTime.Year, 1,1,currentTime.Minute,currentTime.Hour,currentTime.Second,DateTimeKind.Local);
yearEnd = yearEnd.AddYears(1);
double t = (yearEnd.ToUniversalTime() - new DateTime(1970, 1, 1,0,0,0)).TotalMilliseconds;
and above code is returning 1514782800000 i.e. Mon Jan 01 2018 05:00:00 UTC in and Mon Jan 01 2018 10:30:00 Local (india)
what i am expecting is it converts time to Mon Jan 01 2018 00:00:00 local time
By default DateTime creates Unspecified DateTimeKind, so using UTC explicitly helps to avoid confusion. I've tried to rewrite in this way
DateTime currentTime = DateTime.UtcNow;
DateTime yearEnd = new DateTime( currentTime.Year, 1,1,0,0,0, DateTimeKind.Utc);
yearEnd = yearEnd.AddYears(1); // output DateTime has Utc Kind
var unixTimestamp = (yearEnd.Subtract(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc))).TotalMilliseconds;
Console.WriteLine(unixTimestamp);
The output is 1514764800000 which converts to GMT: Monday, 1 January 2018 00:00:00
Update:
In case you need to convert timestamp back to DateTime you may use the following:
public static DateTime UnixTimeStampToDateTime(double unixTimeStamp)
{
System.DateTime dtDateTime = new DateTime(1970,1,1,0,0,0,0,System.DateTimeKind.Utc);
dtDateTime = dtDateTime.AddMilliseconds(unixTimeStamp);
return dtDateTime; // still Utc Kind
}
Usage example if you need to convert to other timezone:
TimeZoneInfo infotime = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time (Mexico)"); // specify your desired timezone here
Console.WriteLine(TimeZoneInfo.ConvertTimeFromUtc(UnixTimeStampToDateTime(unixTimestamp), infotime));
if i understand you right you want the following:
double result = new DateTime(currentTime.Year + 1, 1, 1, 0, 0, 0, DateTimeKind.Local).Subtract(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalSeconds;
Or improved for readablity
DateTime newYear = new DateTime(currentTime.Year + 1, 1, 1, 0, 0, 0, DateTimeKind.Utc);
DateTime uTSBegin = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
double result2 = newYear.Subtract(uTSBegin).TotalSeconds;
I'm trying to convert this unix timestamp
1415115303410
in DateTime, in this way:
private static DateTime UnixTimeStampToDateTime(long unixTimeStamp)
{
System.DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc);
dtDateTime = dtDateTime.AddMilliseconds(unixTimeStamp);
return dtDateTime;
}
But I get a wrong date:
Date: {04/11/0045 00:00:00}
NOTE: dtDateTime.AddSeconds(unixTimeStamp) throws an exception.. my number is in Milliseconds.
with this online conversion tool http://www.epochconverter.com/ I get the right conversion:
04/11/2014 15:35:03 GMT+0:00
How I can convert this one?
Your code is working just fine, as is. Here is a fiddle.
Everyone that is telling you to use AddSeconds is wrong. The number you are giving us is clearly in milliseconds. There are 31,536,000 seconds in a year. 1415115303410 divided by 31536000 is 4487. There hasn't been 4,487 years passed since 1/1/1970.
use AddSeconds instead of AddMilliseconds
private static DateTime UnixTimeStampToDateTime(long unixTimeStamp)
{
System.DateTime dtDateTime = new System.DateTime(1970, 1, 1, 0, 0, 0, 0);
dtDateTime = dtDateTime.AddSeconds(unixTimeStamp);
return dtDateTime;
}
Just use DateTimeOffset
DateTimeOffset date = DateTimeOffset.FromUnixTimeSeconds(1415115303410)
public DateTime FromUnixTime(long unixTime)
{
var epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
return epoch.AddMilliseconds(unixTime);
}
var date = FromUnixTime(1415115303410); // 11/4/2014 3:35:03 PM
Since your number is in milliseconds, Unix time, use AddMilliseconds.
Try This
DateTime date = new DateTime(Convert.ToInt64("1415115303410"));
Microsoft continue thinking about us! All solutions to add seconds/milliseconds is not working with Visual Studio 2017 (.Net 4.6.1). But there is a new solution:
public static DateTime numStrToDate(String val)
{
DateTime dRet = new DateTime(1970, 1, 1, 0, 0, 0, 0);
long dSec;
if (long.TryParse(val, out dSec))
{
TimeSpan ts = new TimeSpan(dSec*10l);
dRet = dRet.Add(ts);
}
return dRet;
}
If you need a UTC time - just add 'System.DateTimeKind.Utc' to the DateTime constructor call.
Date to Timestamp
DateTime date = DateTime.ParseExact(date_string, "dd/MM/yyyy H:mm:ss", null);
Double timestamp = Math.Truncate((date.ToUniversalTime().Subtract(new DateTime(1970, 1, 1))).TotalSeconds);
Timestamp to Date
DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Unspecified);
dtDateTime = dtDateTime.AddSeconds(Double.Parse(arrayFinalResponse[i, 5])).ToLocalTime();
String date = dtDateTime.ToString("dd/MM/yyyy H:mm:ss", CultureInfo.GetCultureInfo("en-US"));
You can do the conversion by using a little trick with date command.
It does depend on your timezone. I live in UTC + 1 so for me it is like this:
h1x1binax:~ # date -d "Thu Jan 1 01:00:00 CET 1970 + 1415115303410 second"
Thu Mar 21 09:16:50 CET 46813
h1x1binax:~ #
So that's not a unixtime timestamp ... it is probably in milliseconds so need to divide by 1000
h1x1binax:~ # date -d "Thu Jan 1 01:00:00 CET 1970 + 1415115303 second"
Tue Nov 4 16:35:03 CET 2014
h1x1binax:~ #
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I'm trying to add the phones current time to my date time list. I need it to be able to subtract with the ticks. I have tried using phonecurrentime.ToString("dd hh:mm"); but because it's a string there are no ticks and all sorts of errors!
I need it to work with DateTime.now.
Here is my code:
InitializeComponent();
List<DateTime> theDates = new List<DateTime>();
DateTime fileDate, closestDate;
theDates.Add(new DateTime(2000, 1, 1, 10, 29, 0));
theDates.Add(new DateTime(2000, 1, 1, 3, 29, 0));
theDates.Add(new DateTime(2000, 1, 1, 3, 29, 0));
// This is the date that should be found
theDates.Add(new DateTime(2000, 1, 1, 4, 22, 0));
// This is the date you want to find the closest one to
fileDate = DateTime.Now;
long min = long.MaxValue;
foreach (DateTime date in theDates)
{
if (Math.Abs(date.Ticks - fileDate.Ticks) < min)
{
min = Math.Abs(date.Ticks - fileDate.Ticks);
closestDate = date;
}
}
Darren Davies above is correct.
You can add/subtract datetime objects. The result is of type TimeSpan, which lets you easily compare date and/or time differences.
Also, you should give a name to each date you add to your list (assign to a variable then add to list). A month later you won't remember what each day meant ;)
if you have a string and want to convert it to DateTime you can use
CultureInfo cf = new CultureInfo("en-us");
if(DateTime.TryParseExact("12 12:45", "dd hh:mm", cf, DateTimeStyles.None, out fileDate))
{
// your code
}
and your code would look like:
List<DateTime> theDates = new List<DateTime>();
DateTime fileDate, closestDate;
theDates.Add(new DateTime(2000, 1, 1, 10, 29, 0));
theDates.Add(new DateTime(2000, 1, 1, 3, 29, 0));
theDates.Add(new DateTime(2000, 1, 1, 3, 29, 0));
// This is the date that should be found
theDates.Add(new DateTime(2000, 1, 1, 4, 22, 0));
CultureInfo cf = new CultureInfo("en-us");
string timeToParse = phonecurrentime.ToString("dd hh:mm");
if(DateTime.TryParseExact(timeToParse, "dd hh:mm", cf, DateTimeStyles.None, out fileDate))
{
long min = long.MaxValue;
foreach (DateTime date in theDates)
{
if (Math.Abs(date.Ticks - fileDate.Ticks) < min)
{
min = Math.Abs(date.Ticks - fileDate.Ticks);
closestDate = date;
}
}
}
if you want to compare the time part of the dateTime you can use TimeOfDay property:
TimeSpan ts = DateTime.Now.TimeOfDay;
foreach (DateTime date in theDates)
{
long diff = Math.Abs(ts.Ticks - date.TimeOfDay.Ticks);
if (diff < min)
{
min = diff;
closestDate = date;
}
}
fileDate = phonecurrentime.ToString("dd hh:mm");
Will not compile. fileDate is a DateTime object. You need to assign it to another DateTime object, not a string.
If phonecurrenttime is a DateTime you can ommit the .ToString() method.
fileDate = phonecurrenttime;
Edit
From your comment, if you simply want to assign the current ddate/time to fileDate you can use DateTime.Now:
fileDate = DateTime.Now;
I need the current Datetime minus myDate1 in seconds.
DateTime myDate1 = new DateTime(1970, 1, 9, 0, 0, 00);
DateTime myDate2 = DateTime.Now;
TimeSpan myDateResult = new TimeSpan();
myDateResult = myDate2 - myDate1;
.
.
I tried different ways to calculate but to no effect.
TimeSpan mySpan = new TimeSpan(myDate2.Day, myDate2.Hour, myDate2.Minute, myDate2.Second);
.
The way it's calculated doesn't matter, the output should just be the difference these to values in seconds.
Code:
TimeSpan myDateResult = DateTime.Now.TimeOfDay;
Your code is correct. You have the time difference as a TimeSpan value, so you only need to use the TotalSeconds property to get it as seconds:
DateTime myDate1 = new DateTime(1970, 1, 9, 0, 0, 00);
DateTime myDate2 = DateTime.Now;
TimeSpan myDateResult;
myDateResult = myDate2 - myDate1;
double seconds = myDateResult.TotalSeconds;
Have you tried something like
DateTime.Now.Subtract(new DateTime(1970, 1, 9, 0, 0, 00)).TotalSeconds
DateTime.Subtract Method (DateTime)
TimeSpan.TotalSeconds Property
How about
myDateResult.TotalSeconds
http://msdn.microsoft.com/en-us/library/system.timespan.totalseconds
you need to get .TotalSeconds property of your timespan :
DateTime myDate1 = new DateTime(2012, 8, 13, 0, 05, 00);
DateTime myDate2 = DateTime.Now;
TimeSpan myDateResult = new TimeSpan();
myDateResult = myDate2 - myDate1;
MessageBox.Show(myDateResult.TotalSeconds.ToString());
You can use Subtract method:
DateTime myDate1 = new DateTime(1970, 1, 9, 0, 0, 00);
DateTime myDate2 = DateTime.Now;
TimeSpan ts = myDate2.Subtract(myDate1);
MessageBox.Show(ts.TotalSeconds.ToString());
TimeSpan myDateResult;
myDateResult = DateTime.Now.Subtract(new DateTime(1970,1,9,0,0,00));
myDateResult.TotalSeconds.ToString();