How to add minutes to time

Question

Guys I want to add Minutes to time for exemple I have 8:50h and I want to add to it another 8:50h; I have tried

time = time.Add(TimeSpan.FromHours(8.5)); // time variable already has 8:50:00 and time it's TimeSpan variable

but I got 17:00h (it treats it like floats) but I want it to be 17:40 (so every 60mins it will add an hall hour).

https://learn.microsoft.com/en-us/dotnet/api/system.datetime.addminutes?view=net-5.0 Try use `AddMinutes` instead of simple `Add` — demo, Mar 02 '21 at 16:10
@MongZhu microsoft should detect better my location... or add support of more languages — demo, Mar 02 '21 at 16:13
@demo just edit the link to remove the `/ru-ru` bit, then it autodetects correctly. — Ian Kemp, Mar 02 '21 at 16:14
"(so every 60mins it will add an hall hour)." I find this a very confusing comment. What result do you expect if `time` has the value `3:00` ? up to now your problem is simply solveable by this line: `timeSpan += timeSpan;` — Mong Zhu, Mar 02 '21 at 16:19

Ian Kemp · Accepted Answer · 2021-03-02T16:14:34.553

5

You don't understand how time and date works in programming. 8.5 is not 8 hours 50 minutes, it's 8 hours 30 minutes because .5 is half of one hour.

The correct way to do this is:

var ts1 = new TimeSpan(8, 50, 0); // 8 hours, 50 minutes, 0 seconds
var ts2 = new TimeSpan(8, 50, 0);
var ts3 = ts1.Add(ts2); // 17:40

edited Mar 02 '21 at 16:14

answered Mar 02 '21 at 16:13

Ian Kemp

1 Answers1