class String

"1604326192".to_time # => ArgumentError: argument out of range
"12/13/2012".to_time # => ArgumentError: argument out of range
"2012-12-13T06:12".to_time(:utc) # => 2012-12-13 06:12:00 UTC
"2012-12-13T06:12".to_time # => 2012-12-13 06:12:00 +0100
"2012-12-13 06:12".to_time # => 2012-12-13 06:12:00 +0100
"06:12".to_time # => 2012-12-13 06:12:00 +0100
"13-12-2012".to_time # => 2012-12-13 00:00:00 +0100

the time part is missing then it is assumed to be 00:00:00.
If the date part is missing then the current date is used and if
If +form+ is +:local+, then the time is in the system timezone.
The time is parsed using Time.parse method.

The +form+ can be either +:utc+ or +:local+ (default +:local+).
Converts a string to a Time value.

def to_time(form = :local)
  parts = Date._parse(self, false)
  used_keys = %i(year mon mday hour min sec sec_fraction offset)
  return if (parts.keys & used_keys).empty?
  now = Time.now
  time = Time.new(
    parts.fetch(:year, now.year),
    parts.fetch(:mon, now.month),
    parts.fetch(:mday, now.day),
    parts.fetch(:hour, 0),
    parts.fetch(:min, 0),
    parts.fetch(:sec, 0) + parts.fetch(:sec_fraction, 0),
    parts.fetch(:offset, form == :utc ? 0 : nil)
  )
  form == :utc ? time.utc : time.to_time
end