p={'x': 1534804991, 'y': 0.1}

p={:x=>1534804991, :y=>0.1}

p.gsub(''x'',':x=>')
p.gsub("'x'",":x=>")
p.sub!(w/xw/, ":x=>")

hash = {'x': 1534804991, 'y': 0.1}
p hash.transform_keys(&:to_sym) # {:x=>1534804991, :y=>0.1}

hash.each_with_object({}) { |(k, v), h| h[k] = v }

p = File.read('xxx.json')
# => "{'x': 1534804991, 'y': 0.1}"

puts p
# => {'x': 1534804991, 'y': 0.1}

puts p.gsub(/'(w+)': /, ':1=>')
# => {:x=>1534804991, :y=>0.1}