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defmodule MyApp.DistanceOfTimeHelpers do |
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@moduledoc false |
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@minutes_in_year 525_600 |
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@minutes_in_quarter_year 131_400 |
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@minutes_in_three_quarters_year 394_200 |
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def time_ago_in_words(naive_date_time) do |
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distance_of_time_in_words(naive_date_time, NaiveDateTime.utc_now()) |
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end |
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def distance_of_time_in_words(from_ndt, to_ndt, opts \\ []) do |
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duration = |
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%{ |
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include_seconds: opts[:include_seconds], |
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seconds: NaiveDateTime.diff(to_ndt, from_ndt) |
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} |
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|> maybe_convert_to_minutes |
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|> maybe_convert_to_years(from_ndt, to_ndt) |
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duration_in_words(duration) |
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end |
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defp maybe_convert_to_minutes(%{seconds: seconds}) when seconds > 59 do |
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%{minutes: round(seconds / 60)} |
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end |
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defp maybe_convert_to_minutes(duration), do: duration |
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defp maybe_convert_to_years(%{minutes: minutes}, from_ndt, to_ndt) when minutes > 525_599 do |
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from_year = if from_ndt.month >= 3, do: from_ndt.year + 1, else: from_ndt.year |
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to_year = if to_ndt.month < 3, do: to_ndt.year - 1, else: to_ndt.year |
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leap_years = |
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if from_year > to_year, |
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do: 0, |
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else: from_year..to_year |> Enum.count(&Calendar.ISO.leap_year?(&1)) |
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minute_offset_for_leap_year = leap_years * 1440 |
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# Discount the leap year days when calculating year distance. |
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# e.g. if there are 20 leap year days between 2 dates having the same day |
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# and month then the based on 365 days calculation |
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# the distance in years will come out to over 80 years when in written |
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# English it would read better as about 80 years. |
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minutes_with_offset = minutes - minute_offset_for_leap_year |
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%{ |
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remainder: rem(minutes_with_offset, @minutes_in_year), |
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years: div(minutes_with_offset, @minutes_in_year) |
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} |
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end |
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defp maybe_convert_to_years(duration, _from_ndt, _to_ndt), do: duration |
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defp duration_in_words(%{include_seconds: true, seconds: seconds}) when seconds in 0..4 do |
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translate_duration("less than %{count} seconds", count: 5) |
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end |
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defp duration_in_words(%{include_seconds: true, seconds: seconds}) when seconds in 5..9 do |
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translate_duration("less than %{count} seconds", count: 10) |
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end |
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defp duration_in_words(%{include_seconds: true, seconds: seconds}) when seconds in 10..19 do |
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translate_duration("less than %{count} seconds", count: 20) |
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end |
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defp duration_in_words(%{include_seconds: true, seconds: seconds}) when seconds in 20..39 do |
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translate_duration("half a minute") |
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end |
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defp duration_in_words(%{include_seconds: true, seconds: seconds}) when seconds in 40..59 do |
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translate_duration("less than a minute") |
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end |
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defp duration_in_words(%{seconds: seconds}) when seconds in 0..29 do |
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translate_duration("less than a minute") |
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end |
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defp duration_in_words(%{seconds: seconds}) when seconds in 30..59 do |
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translate_duration("1 minute") |
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end |
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defp duration_in_words(%{minutes: minutes}) when minutes == 1 do |
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translate_duration("1 minute") |
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end |
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defp duration_in_words(%{minutes: minutes}) when minutes in 2..44 do |
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translate_duration("%{count} minutes", count: minutes) |
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end |
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defp duration_in_words(%{minutes: minutes}) when minutes in 45..89 do |
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translate_duration("about 1 hour") |
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end |
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# 90 mins up to 24 hours |
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defp duration_in_words(%{minutes: minutes}) when minutes in 90..1439 do |
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translate_duration("about %{count} hours", count: round(minutes / 60)) |
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end |
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# 24 hours up to 42 hours |
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defp duration_in_words(%{minutes: minutes}) when minutes in 1440..2519 do |
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translate_duration("1 day") |
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end |
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# 42 hours up to 30 days |
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defp duration_in_words(%{minutes: minutes}) when minutes in 2520..43_199 do |
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translate_duration("%{count} days", count: round(minutes / 1440)) |
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end |
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# 30 days up to 45 days |
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defp duration_in_words(%{minutes: minutes}) when minutes in 43_200..64_799 do |
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translate_duration("about 1 month") |
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end |
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# 45 days up to 60 days |
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defp duration_in_words(%{minutes: minutes}) when minutes in 64_800..86_399 do |
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translate_duration("about %{count} months", count: 2) |
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end |
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# 60 days up to 365 days |
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defp duration_in_words(%{minutes: minutes}) when minutes in 86_400..525_599 do |
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translate_duration("%{count} months", count: round(minutes / 43_200)) |
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end |
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defp duration_in_words(%{remainder: remainder, years: years}) |
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when years == 1 and remainder < @minutes_in_quarter_year do |
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translate_duration("about 1 year") |
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end |
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defp duration_in_words(%{remainder: remainder, years: years}) |
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when years == 1 and remainder < @minutes_in_three_quarters_year do |
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translate_duration("over 1 year") |
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end |
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defp duration_in_words(%{remainder: remainder, years: years}) |
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when remainder < @minutes_in_quarter_year do |
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translate_duration("about %{count} years", count: years) |
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end |
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defp duration_in_words(%{remainder: remainder, years: years}) |
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when remainder < @minutes_in_three_quarters_year do |
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translate_duration("over %{count} years", count: years) |
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end |
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defp duration_in_words(%{years: years}) do |
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translate_duration("almost %{count} years", count: years + 1) |
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end |
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defp translate_duration(msg, opts \\ []) do |
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if count = opts[:count] do |
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Gettext.dngettext(MyApp.Gettext, "durations", msg, msg, count, opts) |
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else |
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Gettext.dgettext(MyApp.Gettext, "durations", msg, opts) |
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end |
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end |
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end |
