DateTime: how to set a day ? or an hour?

General
1

just playing with datetime instead of date object
as all the properties are read only, how do you set a specific time to a datetime object ?
:frowning:

2

Constructor or DateInterval

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3

Just examples:

Var d As New DateTime(2020, 01, 05, 14, 23, 05)

or

Var c As DateTime
c = DateTime.FromString("2021-03-04 09:00:55")

or

Var k As  DateTime = DateTime.Now.SubtractInterval(0,4,1)
4

letā€™s say I want to keep the date, but only change the hour to 8 and the minutes to 0
itā€™s really complicated compared to the ā€œoldā€ Date objectā€¦
I just donā€™t understand WHY these datetime properties are read only ā€¦

5

The short answer is that the objects are now ā€œimmutableā€ ā€“ that is to say canā€™t be altered ā€“ so you just have to change your mindset and create new objects when you need a different time. DateInterval can be your friend here, or other ways you can construct a new DateTime object.

Itā€™s not so much complicated as it is just a different way of thinking, when you are used to the older Date object methods.

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6

One way would be:

Var k As  DateTime =  DateTime.FromString(DateTime.Now.SQLDate + " 08:00:00")
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7

Dim newdate As new DateTime(OldDate.Year, OldDate.Month, OldDate.Day, 8, 0)

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