Converting string time to find difference in time from Time.now ~ Ruby on Rails

user_17988381 0
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I have the time of this format "20:10 PM", I need to find the difference between Time.now with the given time

For example If Time.now says 2022-05-17 18:32:52.133290553 -0700, I need to find the difference between Time.now and "20:10 PM" for same-day today.

I am not able to find any references on Ruby on Rails for that.

ruby-on-rails ruby
2 Answers

Very simple way:

>> Time.now - Time.parse("20:10 PM")
=> 10995.706874

Time.parse will assume today's date if it is not given a date. Returned result is in seconds.

user_2070900

Assuming you always want to compare Time.now with a time from today (i.e 20:30 for today), you could construct a new Time instance for the time you're comparing.

todays_year = Time.now.year
todays_month = Time.now.month
todays_day = Time.now.day
time_to_compare =  Time.new(todays_year, todays_month, todays_day, 20, 30) # 20 and 30 represent the dynamic time you want to compare
time_diff = ((Time.now - time_to_compare) / 3600).round(2) # assuming you want to know the difference in hours and rounded to 2 decimal places
user_92871810
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