2.5 year-old sleeping pattern change and suggestion

My 31-month-old has been sleeping late since he reach 30 month. He used to sleep between 8:30pm. to 9:00p.m. Now, no matter how early I put himtosleep, he would fall asleep after 9:30p.m. unless he was very tired and did not get enough nap during the day.

Some issue to consider about sleep training:

1.Only one person should be responsible for putting the kid tosleep(except that person has other duty to fulfill). Create consistency.
2. Reach an agreement with your spouse about when would be appropriate to put your daughter to sleep.
3.Create a simple nightly routine like bath -> story time ->brushteeth and washing face -> kiss and goodnight to everyone thengo tosleep. Kids like routine and they enjoy knowing what to expectnext.
4.Give out warning at 10 minutes, 5 minutes, 3 minutes and 1 minutes until bedtime to your daughter. Example: 10 more minutes, then it is bedtime,ok?