def millis = new Date().time
def nanos = millis * 1000 * 1000L

[[time: nanos + 7 * 1, next_time:(nanos + 77) * 1, temp:14.6],
 [time: nanos + 7 * 2, next_time:(nanos + 88) * 2, temp:18.1],
 [time: nanos + 7 * 3, next_time:(nanos + 99) * 3, temp:23.6]]

def today  = new Date()
def millis = today.time
// the "g" makes this a bignum, with as many bits as needed
def nanos  = millis * 1000 * 1000g

[[time: nanos + 7 * 1, next_time:(nanos + 77) * 777, temp:3.351],
 [time: nanos + 7 * 2, next_time:(nanos + 88) * 888, temp:2.355],
 [time: nanos + 7 * 3, next_time:(nanos + 99) * 999, temp:2.728]]