# How to format the x-axis by hour increments

I'm working with a dataset that includes the bedtimes of participants for weekdays, weekends, and the entire week. The bedtimes are represented as strings in the "hh:mm" format. Here's a sample of the data:

Au cours de la semaine En weekend Toute la semaine
22:30:00 24:30:00 23:30:00
21:30:00 23:00:00 22:15:00
23:00:00 24:30:00 23:45:00
23:30:00 27:00:00 25:15:00
24:30:00 25:30:00 25:00:00
21:45:00 21:45:00 21:45:00
23:15:00 24:15:00 23:45:00
22:30:00 24:30:00 23:30:00
23:45:00 24:30:00 24:07:30
20:30:00 21:30:00 21:00:00
22:30:00 24:00:00 23:15:00
missing missing missing
21:15:00 21:00:00 21:07:30
22:30:00 24:30:00 23:30:00
23:45:00 26:30:00 25:07:30
21:30:00 23:30:00 22:30:00

I'm struggling to fix the x-axis intervals to display time ticks at a fixed 1-hour interval. Here's the code I used :

``````import pandas as pd
import seaborn as sns
import matplotlib.pyplot as plt
import matplotlib.ticker as ticker

# given the sample data in this question

# Convert time data to minutes
for column in df.columns:
df[column] = df[column].apply(lambda x: int(x.split(':'))*60 + int(x.split(':')))

# Melt the DataFrame
df_melt = pd.melt(df, var_name='Category', value_name='Time')

# Create a function to format x-axis ticks
def format_func(value, tick_number):
# Convert minutes to hours and minutes
hours = int(value // 60)
minutes = int(value % 60)
return f"{hours}:{minutes:02d}"

# Create the boxplots
fig, ax = plt.subplots(figsize=(10,6))
sns.boxplot(x="Time", y="Category", data=df_melt, orient='h', ax=ax, color='lightblue')

# Add means as diamond markers
sns.pointplot(x="Time", y="Category", data=df_melt, orient='h',
ax=ax, color='darkred', markers='D', join=False, errorbar=None)

# Format the x-axis ticks
ax.xaxis.set_major_formatter(ticker.FuncFormatter(format_func))

# Set the labels
plt.xlabel("Time (HH:MM)")
plt.title("Boxplots of Bedtime")

# Display the plot
plt.show()
``````

Can anyone suggest a way to modify the code to ensure the x-axis ticks have a fixed 1-hour interval between them? 