There are many different ways to write time. As an example, you can choose either the 12 or 24 hour format to show the time. However, I think that's an overrated topic. Instead, how do you split the hour and minute digits?
As far as I know, there are three main ways of splitting digits:
10:10pm)10.10pm)1010pm)22:10
22.10
2210
10:10pm in 24 hour format with 3 different common separators
I have grown up using the colon for all my hour-minute time separation needs. More recently however, I have started to see the dot/full-stop being used more frequently in text to communicate time. While I do understand that it is easier (on both phone and computer) to use the . over : when chatting. I have also started to see it more frequently in official announcements, publicity, etc.
Of course, it can also simply be a choice of style. However, I would argue that it's slightly more nuanced then that.
We use the '.' for many different reasons. Most notably, mathematics uses it as a decimal point for our base-10 system.
However, as it turns out, minutes are not base 100. An hour does not have 100 minutes, but 60. As such, minutes are functionally base-60.
As the full stop/decimal point is already used in mathematical contexts with a decimal base, applying the . makes less sense when referring to time; especially when there is : to do the job.
While it is a lot more convenient to use . when referring to time, I believe that using the : as the GO-TO separator of time...
Not that anyone disagrees... Right?