Convert date bezel to time

date_bezel_to_time.py

# Small utility to help me set the correct time on my Swatch watch reference:
# Sistem51 Hodinkee Stoplight Neon Remix watch

from math import floor, trunc


def frac(n):
    return n - floor(n)


for idx in range(1, 32):
    dec_time = 60 / 31. * idx
    minute = trunc(dec_time)
    seconds = round(frac(dec_time) * 60)
    print("%2d: %2d minutes, %2d seconds" % (idx, minute, seconds))

## Output ##

#  1:  1 minutes, 56 seconds
#  2:  3 minutes, 52 seconds
#  3:  5 minutes, 48 seconds
#  4:  7 minutes, 45 seconds
#  5:  9 minutes, 41 seconds
#  6: 11 minutes, 37 seconds
#  7: 13 minutes, 33 seconds
#  8: 15 minutes, 29 seconds
#  9: 17 minutes, 25 seconds
# 10: 19 minutes, 21 seconds
# 11: 21 minutes, 17 seconds
# 12: 23 minutes, 14 seconds
# 13: 25 minutes, 10 seconds
# 14: 27 minutes,  6 seconds
# 15: 29 minutes,  2 seconds
# 16: 30 minutes, 58 seconds
# 17: 32 minutes, 54 seconds
# 18: 34 minutes, 50 seconds
# 19: 36 minutes, 46 seconds
# 20: 38 minutes, 43 seconds
# 21: 40 minutes, 39 seconds
# 22: 42 minutes, 35 seconds
# 23: 44 minutes, 31 seconds
# 24: 46 minutes, 27 seconds
# 25: 48 minutes, 23 seconds
# 26: 50 minutes, 19 seconds
# 27: 52 minutes, 15 seconds
# 28: 54 minutes, 12 seconds
# 29: 56 minutes,  8 seconds
# 30: 58 minutes,  4 seconds
# 31: 60 minutes,  0 seconds

swatch.png